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Tulip Groups
The genus Tulipa consists of 15 Tulip Groups
The official classification of the genus Tulipa defines
14 groups or divisions of cultivated varieties - mainly on the basis
of flower shape, flowering season and parentage - with a fifteenth
division containing species and other miscellaneous varieties.
These tulip groups have had several reorganizations over the years,
so some tulip lovers may know some varieties as being under different
categories.
These are the current Divisions:
 Division
1 - Single early varieties
These have cup-shaped flowers around 7.5cm (3in) wide.
They grow to 25-60cm (10-24in) tall.
They flower mainly in mid spring, or sometimes a little earlier.
{some of these were once included in the Darwin section)
 Division
2 - Double early varieties
These have double, peony like flowers around 7.5-l0cm (3-4in) wide
They grow to 30cm (1ft) tall.
Their flowers open in mid spring.
 Division
3 - Triumph varieties
These have conical flowers, are more rounded and up to 7.5cm (3in)
wide. They stand 40-60cm (16-24in) tall.
They flower in mid spring and often last until late spring..
(some of these were formerly known as Mendel tulips)
 Division
4 - Darwin tulips
The plants of this tulip group have huge, goblet-like flowers usually
up to 15cm (6in) across, but sometimes can get to 20cm (8in).
They grow to 55-70cm (22-28in) tall.
They open in late spring or a little earlier. (these were formerly
Division 5)
Division 5 - Single late tulips
Their flowers are almost squarish to oval and often with pointed petals.
These are among the tallest types and grow up to 80cm (32in) in height.
They flower in late spring and often last into very early summer.
(these are sometimes called May-flowering)
Division 6 - Lily-flowered varieties
Plants of this tulip group are very lily like, hence their name. Their
flowers are long and trim with pointed petals flaring outwards at
their tips to a width of up to 15cm (6in).
They grow to 50-65cm (20-26in) high.
They open in late spring or sometimes a little earlier. (formerly
division 7).
 Division
7 - Fringed varieties
These have flowers of sharply fringed petals.
These grow up to 80cm (32in) in height.
They flower in late spring and often last into very early summer.
(These were formerly part of the Cottage division and were also
known as orchid-flowered tulips)
 Division
8 - Viridiflora varieties
These are sometimes known as green tulips and are distinguished
by having distinct green streaks or suffusions on their petals.
These grow up to 80cm (32in) tall.
They flower in late spring and often last into very early summer.
(They were formerly part of the Cottage group).
 Division
9 - Rembrandt tulips
This tulip group have plants that are affected by a harmless virus,
which causes the flower colors to streak into striped or blotchy
patterns.
These grow up to a height of 80cm (32in)..
They flower in late spring and often last into very early summer.
 Division
10 - Parrot tulips
These have large flowers with frilled and/or twisted petals and
many are bi-colored.
These grow up to 80cm (32in) tall.
They flower in late spring and often last into very early summer.
Division 11 - Double late or Peony-flowered varieties
These have large, fully double, rather squat flowers up to 12cm
(5in) wide
They grow to 40-60cm (16-24in) in height.
They flower in late spring.
Division 12 - Kaufmanniana hybrids
The plants of this tulip group have waterlily-like flowers, which
open out flat to 6cm (2½in) wide and are usually bi-colored
and the leaves of some are striped or mottled with reddish or brownish
purple.
They grow to only 10-25cm (4-10in) high. They flower in early spring.
(These are sometimes called waterlily tulips - are derived primarily
from Tulipa kaufmanniana, a starry flowered species from Turkestan,
named in honor of the Russian botanist, Kaufmann).
 Division
13 - Fosteriana hybrids
Their flowers are slender when closed up, opening to 18-20cm (7
-8in) wide in full sun and have a flower color ranging from scarlet
to yellow or white
They grow to a height of 20-40cm (8-16in). They flower in mid spring.
(These have been cultivated mainly from Tulipa. fosteriana , a shiny
green-leaved bright red-flowered species from the mountains of Central
Asia).
 Division
14 - Greigii hybrids
This group have flowers which are large and brightly colored with
their leaves having wavy edges and bold purple-brown or maroon stripes.
Most grow up to 20-30cm (8-12in) tall, but some up to 50cm (20in),
They flower early to mid spring
(They are derived largely from T. greigii, again from Central Asia).
 Division
15 - Species tulips
This tulip group covers a wide range of flower colors,
shapes and sizes, to make up the final division. Most are smaller
and more delicate in appearance than the modern hybrids, but are
nevertheless equally hardy.
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