If you love both <a href="https://nameberry.com/list/317/unique-baby-names">unique baby names</a> and flower names for girls, Amaryllis might be a perfect choice for you. 

A showier flower name than Lily, but in the same botanical family, Amaryllis is not as outre as it might at first sound. It was used in Greek poetry as the appellation of pure pastoral beauties; Amaryllis is the heroine of Virgil's epic poem Ecologues, after whom the flower was named. 

Other references are characters in the George Bernard Shaw play Back to Methuselah and The Music Man. James Bond-creator Ian Fleming had a half sister named Amaryllis Marie-Louise Fleming, who was a noted British cellist.

Amaryllis

Azalea is one of the fresher flower names, along with Zinnia and Lilac, that are new to the name bouquet — in fact, it entered the Social Security list for the first time in 2012. So if Lily and Rose are too tame for you, consider this brilliant pink springtime blossom with a touch of the unusual that has been growing in popularity. 
 Azalea is the name of the princess heroine of the novel Entwined, and, most recently, is connected to musical artist Iggy Azalea.

Azalea

Now that parents have picked virtually every name in the garden, from the common Rose to the captivating Zinnia, some are reconsidering the old, more generic names like Flora and Posy and Blossom — which was last in favor in the 1920s and still has a Floradora showgirl aura.
 The most well-remembered recent representative is the eponymous character in the early nineties sitcom Blossom. Blossom was also one of the Powderpuff Girls and appeared on Dawson's Creek.
 A real-life namesake is jazz singer Blossom Dearie.

Blossom

One of the rarest of the flower names, that of the blossom celebrated in Japan as a symbol of the sun and a possible object of meditation. One of the rare flower names counted among <a href="https://nameberry.com/list/351/names-for-autumn-babies">names for autumn babies</a>, Chrysanthemum is also one of the most unusual nature-themed <a href="https://nameberry.com/search/girls-names/c">girl names starting with C</a>.
 Chrysanthemum is the title of a 1991 children's picture book by the American writer and illustrator Kevin Henkes. The plot deals with a young mouse named Chrysanthemum, who loves her name until classmates tease her about it.

Chrysanthemum

Clover is a charming, perky choice if you want to move beyond hothouse blooms like Rose and Lily, and it's recently become a new celeb favorite, chosen by both Neal McDonough and Natasha Gregson Wagner, who used it to honor her mother, Natalie Wood, one of whose most iconic films was Inside Daisy Clover. 
 Clover also has a long association with good luck, via the four-leaf clover, and through the shamrock symbol of Ireland. It first came to wide notice via a couple of soap opera characters.
 In the movie The Good Shepherd , Angelina Jolie's character is called Clover--but her birth name was actually Margaret.

Clover

CLOVEREE

Delphinium is the proper name for larkspur. It's also related to names like Delphine, which are connected to dolphins (the flowers were thought to resemble a dolphin's back).

Delphinium

Iris has so much going for it. It's a fashionable flower name. It's a mythological name, from the Greek goddess of the rainbow. And it's a classic name, always ranking in the girls' Top 1000 but now at its highest point ever.
 
Iris is directly derived from the Greek word iris, meaning "rainbow." In Greek mythology, rainbow goddess Iris was a messenger for Zeus and Hera who rode the rainbow as a multicolored bridge from heaven to earth. 
 The botanical iris also carries evocative symbols. In ancient times, the Iris was considered a symbol of power and majesty, the three petal segments representing faith, wisdom and valor. This image led to the naming of the colored part of the eye.
In the contemporary world, Iris has amazing international versatility, ranking highly throughout the English-speaking world as well as in a diverse range of countries from Spain to Slovenia, France to Sweden.
 Part of Iris's rise is due to its celebrity power: Jude Law and Sadie Frost, Judd Apatow and Leslie Mann, and Renee O'Connor all chose Iris for their daughters.
 A notable modern bearer was the prolific British novelist Iris Murdoch. Frequently seen on screen, characters called Iris have been played by Jodie Foster, Jane Fonda and Kate Winslet, and Iris Chase is the narrator in the Margaret Atwood novel The Blind Assassin.

Iris

Jessamine, a charming name occasionally heard in England, is just beginning to be appreciated in the U.S. as a possible successor to all the Jess names of the past. It's also spelled Jessamyn, as in Quaker novelist Jessamyn West, author of Friendly Persuasion--who started life with Jessamyn as her middle name.
 Jessamine began to be used as a first name in Britain around 1900, along with other flower-related names. Yasmin and Yasmine are other Jasmine variations.
 This would make a great choice as a namesake honoring a Jessica.

Jessamine

Jonquil is an unusual flower name that is less outlandish than Daffodil and less common than Daisy. It just might appeal to parents seeking a singular botanical option. 
Unlike most flower names, Jonquil wasn't introduced until the 1940s, and saw some usage in the U.K. during the forties and fifties.

Jonquil

Lavender lags far behind sweet-smelling purple-hued sister names Violet and Lila, but is starting to get some enthusiastic attention from cutting-edge namers along with other adventurous nature names like Clementine and Marigold. 

 The flower's name derives from Latin lividus "bluish", influenced by lavō "wash" due to use of lavender in washing clothes. It has long been used in traditional medicine and in cooking for its sweet fragrance and soothing properties. But it also has a long history as a name, going back to the eighteenth century, when it was also used for boys. 

 Famous fictional namesakes include Lavender Brown, a witch character in the Harry Potter saga, and the eponymous heroine's best friend in Roald Dahl's Matilda.

Lavender

Could Lilac be the next Lila or Lily or Violet? It certainly has a lot going for it--those lilting double 'l's, the fabulous fragrance it exudes, and the fact that it's a color name as well, providing a ready made nursery theme. In addition, the lilac is symbolic of first love.
 Actor Stephen Moyer was ahead of the curve when he named his daughter Lilac in 2002.

Lilac

Linnea is an attractive <a href="https://nameberry.com/baby-names/173/scandinavian-names">Scandinavian name</a> that derives from the renowned 18th century Swedish botanist Carl Linnaeus, who developed the Linnean system of classifying plants and animals.
 Linnea is megapopular in Sweden and Norway, ranking in the Top 8--it was the Number 1 name in Norway in a recent year, and actually appeared in the U.S. Top 1000 in 1903, reaching as high as 744 in 1945.
 There is a charming children's book called Linnea in Monet's Garden in which the protagonist visits the Giverny gardens that inspired the great Impressionist painter.
 All in all, Linnea is a lovely, lilting name that could make an interesting namesake for an Aunt Lynn or Linda.

Linnea

A name that sounded unthinkably priggish until it became attached to Domestic Goddess British TV chef Nigella Lawson (named for her father), who gave it a big dollop of glamour. 

Nigella

Petal is the soft and sweet-smelling name of a character in the novel and film, The Shipping News. With the rise of such flower names as Poppy and Posy, we believe Petal — down-to-earth yet romantic — has its own appealingly distinctive style. Celebrity chef Jamie Oliver named his daughter Petal Blossom Rainbow in 2009.

Petal

Literary heritage: the "Loony Tunes" girlfriend of Porky Pig.  But with the increasing popularity of all kinds of unusual botanical names, Petunia may be a name we start to hear more of.  Perhaps-more-pleasing Petunia alternatives: Petal, Posy, Poppy.

Petunia

Poppy, unlike most floral names which are sweet and feminine, has a lot of spunk. Long popular throughout the rest of the English-speaking world, Poppy is finally starting to rise toward the top in the US, where it entered the Top 1000 for the first time in 2016.

 British TV chef Jamie Oliver used the name for his eldest daughter, Poppy Honey Rosie, as did Anthony Edwards, Jessica Capshaw, and Anna Paquin and Stephen Moyer. A notable adult Poppy is Australian Without a Trace star Poppy Montgomery (full name Poppy Petal Emma Elizabeth – she and her sisters are all named after flowers: Lily, Daisy, Marigold and Rosie).

 Due to the flower's bold crimson color, Poppy makes an especially good choice for a redhead. In the UK, it is a traditional <a href="https://nameberry.com/list/605/names-for-november-babies">name for November babies</a>, due to the flower's association with Remembrance Day (Nov 11), honoring the memory of members of the Armed Forces who have died in the line of duty.

 Other Poppy-like names to consider: Pippa, Piper, Posey and Petal.

Poppy

Posey is fashionable in England, a country of gardeners, but this pretty bouquet-of-flowers name is only starting to be heard here. 

A possible alternative to Rosy or short form for Josephine. Posey (or Posy or Posie) could also work as a nickname for a range of other names, from Penelope to Sophia. Interestingly, Posie is the most popular spelling of the name, by a hair, with Posey second and Posy far behind.

Other P-beginning flower names you may want to consider along with Posey: Poppy, Petal, Primrose. <a href="https://nameberry.com/search/girls-names/p">Girl names that start with P</a> are definitely cool again.

Posey

A quaint and quirky flower name, until recently considered a bit too prim for most American classrooms but brought back to life in recent years by the attractive character of Primrose "Prim" Everdeen in the Hunger Games series. In the Top 300 girl names in England and Wales and on Nameberry, Primrose remains rare in the US, but is made more accessible by a raft of sweet nickname options, including Rosie and Posy.

 The flower name Primrose derives from Latin prima rosa, meaning "first rose", since primrose flowers are among the first to appear in early spring, heralding the coming of better weather. Primrose also has an alternative history as a Scottish surname deriving from the place name Penrhos, from the Welsh words pren "tree" and rhos "moor." The spelling was later altered due to association with the flower.

 In the H. E. Bates book and 90's British TV series, The Darling Buds of May, there is a character named Primrose Violet Anemone Iris Magnolia Narcissa Larkin, who has twin sisters named Zinnia and Petunia.

Primrose

Associated with the ancient Rosetta stone, this is also the pretty Italian pet form of Rosa. 

Rosetta

Violet is soft and sweet, yet with a vivacious edge. 
The violet is a delicate, sweet-smelling spring flower, associated with faithfulness and modesty, and also the seventh color of the rainbow, named after the flower’s vivid purple hue. 
Today, Violet is the top flower name for girls, outranking Lily and Iris in the Top 100, and the second most popular color name for girls after Scarlett. 
A name that dozed quietly for decades, Violet was popular a hundred years ago, then began its steep descent, bottoming out in the early 1980s. But it started rising again in the late 1990s and climbed even more sharply after Jennifer Garner and Ben Affleck chose it for their daughter in 2005. 
It is now well-used by celebrity parents, including the daughters of Christina Milian, Emily Strayer, Nathan Followill, Dave Grohl, and Emily Blunt. 
In children’s literature, Violet Beauregarde in Charlie and the Chocolate Factory does it no favors, but Violet Baudelaire in Lemony Snicket's A Series of Unfortunate Events</em, and Violet Parr in the animated film The Incredibles, have helped to redeem it for today’s parents. 
Violet is also the first name of Dowager Bridgerton, the matricarch in the show Bridgerton, a reminder of the name’s genteel, vintage side. 
International variations of Violet include Viola, as in the heroine of Shakespeare’s Twelfth Night, French Violette, and snappy Violeta and Violetta.

Violet

Violetta is a more vibrantly colored, feminissima form of Violet. It is the name of the heroine of the Verdi opera La Traviata--in fact Violetta was the original title of the work.

Violetta

A frilly southern-accented flower name yet to be planted on many birth certificates. In the language of flowers, the wisteria is a symbol of devotion. It is named for American horticulturalist John Caspar Wister.

Wisteria

knitpixie's list "Beautiful bloom appellations" of 23 great name ideas: Amaryllis - Wisteria!

Beautiful bloom appellations

A beautiful bouquet of blossom names for flowery sweet baby girls or flower power book characters.