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Published In: Species Plantarum 2: 642. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: Nearly 300 species, chiefly of Arctic and Alpine regions, extending also in temperate zone and at higher elevations into the tropics. Only 23 species are recorded from our area.
Comment/Acknowledgements: A very natural group and with highly variable species. Recognition of infra specific ranks and even species, should be very cautiously done. It is surely unnecessary and useless to describe a species and at the same time to recognize one or more `varieties' of it in the same one gathering, when these `varieties' or variants are part of the natural variability inherent in the population.

Furthermore, in the absence of petals, there is no difference between this genus and Erophila, and Draba tenerrima O.E. Schulz. can be placed in both the genera because it has no petals. However, Draba tenerrima looks more like Erophila and there-fore, has been transferred to that genus.


 

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Annual to perennial herbs, often caespitose, usually hairy with branched or simple hairs. Aerial stem scapose or leafy. Basal or radical leaves usually densely rosulate, shortly stalked to sessile (very rarely long stalked) ; cauline leaves usually sessile; all leaves simple, entire to sinuate-dentate. Racemes usually ebracteate, corymbose. Flowers small, sometimes mediocre, yellow or whitish (often drying white), rarely lilac, pedicellate. Sepals subequal, not or slightly saccate at base. Petals obovate-cuneate, apex subemarginate or entire. Stamens 6 (sometimes outer 2 abortive), without appendages (rarely outer filaments 1-dentate); anthers ovoid or oblong, obtuse. Nectar glands various, lateral 2-4 lobed, often lobes joined forming a horse-shoe shaped structure; middle glands usually absent. Ovary often broadly or narrowly elliptic, 4-many ovuled; style usually distinct with short stigma. Siliculae usually short (rarely siliquiform), ovate, suborbicular to elliptic or lanceolate, broadly septate, bilocular, dehiscent, straight or contorted, usually compressed; valves plane to subconvex, often with a distinct mid-vein, glabrous or hairy; septum membranous, complete, usually not veined; seeds often biseriate in each locule, 2- many, ovate or elliptic, often pale brown, not mucilaginous when wet; radicle accumbent.
 

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1 Flowering shoot aphyllous, scapose (rarely 1-2 leaved) (2)
+ Flowering shoots leafy, usually many leaved (rarely 1-2 leaved) (13)
2 (1) Seeds large, c.3 mm long; fruits 12-20 mm long. Leaves Long, needle-like Draba hystrix
+ Seeds small usually c.1 (-2) mm or less long; fruits usually up to 10 mm long. Leaves not needle-like (3)
3 (2) Petals (4.5-) 5-6 mm long (4)
+ Petals (1.5-) 2.5-4 mm long (7)
4 (3) Racemes 15-30-flowered (rarely less); seeds c.0.5 mm long Draba olgae
+ Racemes 5-10-flowered (rarely 3 or 12 flowered) seeds c.1 mm long (5)
5 (4) Plants ± floccose-hairy with short, branched soft white hairs; siliculae usually 10-15 mm long Draba tibetica
+ Plants ± ciliately hairy with simple and branched hairs; siliculae 3-8 mm long (6)
6 (5) Leaves with ± 3 longitudinal veins Draba trinervis
+ Leaves with 1 mid-vein
7 (3) Plants, especially leaves, floccose with short, branched or simple soft whitish hairs (8)
+ Plants ± ciliately hairy with simple or branched hairs (9)
8 (7) Siliculae 5-8 mm long, lanceolate or oblong-elliptic, somewhat contorted, compressed; style 1-1.5 mm long Draba winterbottomii
+ Siliculae usually 3-4 (-5) mm long, ovoid, inflated; style c. 0.5 mm long Draba korschinskyi
9 (7) Petals c.2.5 mm long Draba melanopus
+ Petals (3-) 4-6 mm long (10)
10 (9) Siliculae linear or elliptic-oblong, compressed (11)
+ Siliculae ovoid or elliptic- ovate, sub inflated or Sub-compressed (12)
11 (10) Siliculae (submature). Ovate-lanceolate c. 6 mm long, 2-3 mm broad; pedicel 8-10 mm long in fruit Draba pakistanica
+ Siliculae 5-10 mm long, 2.5-3.5 mm broad, oblong- elliptic; pedicel 4-6 mm long in fruit Draba setosa
12 (10) Petals 2.5-3 mm broad; basal leaves 3-5 mm long, 1 mm broad Draba cachemirica
+ Petals c. 1.5 mm broad ; basal leaves (2.5-) 5-25 mm long, (1-) 2-3 (-4) mm broad Draba oreades
13 (1) Annuals (14)
+ Perennials (16)
14 (13) Petals c. 4 mm long; siliculae 8-20 mm long c.2 mm broad Draba stenocarpa
+ Petals 1-2 mm long; siliculae 5-8 mm long, c. 2.5 (-3) mm broad, oblong-elliptic (15)
15 (14) Racemes 3-5-flowered ; petals c. 1 mm long, about as long as sepals Draba ellipsoidea
+ Racemes many flowered; petals c. 2 mm long, slightly longer than the sepals Draba nemorosa
16 (13) Seeds sub-biseriate, large, c.2 mm long, obscurely winged Draba aubrietoides
+ Seeds biseriate, small, c. 1 mm long, not winged or margined (17)
17 (16) Plants not caespitose; stem usually decumbent, sparsely branched; fruits 10-20 mm long, 2.5-3 mm broad Draba falconeri
+ Plants caespitose, usually erect and branched from the base; siliculae usually up to 10 mm long and 2 mm broad (18)
18 (17) Plants tomentose with short, branched white hairs (rarely mixed with long simple hairs) (19)
+ Plants ± ciliately hairy with simple or branched hairs (22)
19 (18) Sepals persistent in fruit; siliculae 3-4 mm long, 2.5-3 mm broad, ovate-orbicular, not contorted, glaprous Draba ludlowiana
+ Sepals caducous; siliculae (3.5-) 6-14 mm long, 1.5-2 mm broad, oblong-linear, ± pubescent and contorted (20)
20 (19) Heterotrichous (short branched hairs mixed with simple or forked long hairs) Draba lasiophylla
+ Homotrichous (with short and branched hairs) (21)
21 (20) Seeds 3-6 in each locule Draba glomerata
+ Seeds 16-20 in each locule Draba lanceolata
22 (18) Siliculae linear, 6-14 mm long; pedicel 15-25 (-30) mm long in fruit ; racemes lax, up to 15 cm long in fruit Draba gracillima
+ Siliculae ovate-oblong, 2.5-5 mm long; pedicel 4-6 mm long in fruit racemes capitate, congested, up to 4 (-5) cm long in fruit Draba altaica
 

Lower Taxa
 
 
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