Botanical Survey of India | Flora of India

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Annual, perennial or rarely biennial herbs or dwarf shrubs, sometimes with woody rootstocks; stems scapose or leafy, often elongating after flowering, usually beset with stellate, furcate or simple hairs, rarely glabrous. Leaves simple, entire or shortly dentate, ciliate; basal leaves usualy rosulate, sessile or short-stalked; cauline leaves when present amplexicaul, mostly sessile, rarely shortly petiolate. Flowers in ebracteate racemes or corymbs, occasionally bracteate, yellow or white, rarely purple, lilac or rose-coloured. Sepals subequal, erect; inner ones broadly ovate, rarely slightly saccate at base, rounded or blunt at apex; outer ones longer, elliptic, thin along margins. Petals obovate-cuneate, entire or subemarginate, rarely absent. Stamens 6, or 4 with 2 outer abortive ones; filaments linear, often broadened towards base, rarely outer ones 1-dentate; anthers ovoid or oblong. Nectar glands various, laterals usually 2- or -lobed, often joining to form a horse-shoe shaped structure; middle glands mostly absent. Ovary sessile, flat and ellipsoid or rarely cylindrical; ovules 4 to many; style distinct, persistent; stigma bilohed or depressed capitate. Fruits ovoid-suborbicular to ellipsoid, rarely siliquiform or linear, broadly septate, bilocular, straight or twisted, pilose or smooth; valves flat to subconvex, reticulately nerved with a distinct median vein at base or obscurely veined; septum of the replum membranous with small irregular polygonal cells. Seeds 2-many in 2 rows in each locule, ovoid or ellipsoid, rarely slightly winged, pendulous, radicle accumbent.

In Arctic, temperate and high altitudes of tropical zones; about 300 species, 33 in India.



KEY TO THE SPECIES


1a. Flowering stem scapose, rarely 1 - 2-leaved 2
b. Flowering stem leafy 10
2a. Petals absent 30. Draba tenerrima
b. Petals present 3
3a. Dried basal leaves usually 3 (-5)-nerved 32. Draba trinervis
b. Dried basal leaves mostly 1-nerved 4
4a. Leaves sparsely white tomentose 5
b. Leaves densely white tomentose 9
5a. Fruits oblong-ellipsoid, compressed 26. Draba setosa
b. Fruits ovoid, inflated 6
6a. Ovary 24-ovuled; fruits obtuse at apex 14. Draba humillima
b. Ovary 4 - 12-ovuled; fruits acute at apex 7
7a. Fruits rounded at base; leaves greenish beneath, with simple or branched hairs 8
b. Fruits sub-bisaccate at base; leaves whitish beneath with dense stellate hairs 15. Draba korschinskyi
8a. Leaves oblong-linear, 3 - 4 (-5) mm long, rigid, mid-vein prominent; fruits 3 - 4 x 2 - 2.5 mm 5. Draba cachemirica
b. Leaves oblong or elliptic-obovate, 6 -12 (-15) mm long, chartaceous, mid-vein not prominent; fruits (3-) 4 - 6 x 3 - 5 mm 23. Draba oreades
9a. Stems radical, 1 - 5 cm long; ovary 4 - 8-ovuled; style 1 - 2 mm long 1. Draba affghanica
b. Stems erect, 3 - 10 cm long; ovary (8-) 10 - 14-ovuled; style 0.5 - 0.75 mm long 22. Draba olgae
10a. Scape with 4 - 14 or more leaves, uniformly arranged throughout 11
b. Scape with (1-) 2 - 3 (-5) leaves, usually below the middle 14
11a. Leaves sessile, often semi-amplexicaul 25. Draba radicans
b. Leaves shortly petioled 12
12a. Flowers yellow; fruits ovoid to ellipsoid 3. Draba amoena
b. Flowers violet; fruits oblong 13
13a. Stem 6 - 8-foliate; fruits slightly acute, pilose 8. Draba elata
b. Stem 14-foliate or more; fruits obtuse, glabrous 24. Draba polyphylla
14a. Plants annual, rarely perennial; flowers yellow (white in D. elllpsoidea); fruits usually with rudimentaty styles, rarely styliferous 15
b. Plants perennial; petals white (yellowish white or yellow in D. tibetica); fruits styliferous 22
15a. Seeds sub-biseriate, ca 2 mm long; margins slightly winged 4. Draba aubrietoides
b. Seeds biseriate, 0.5 - 1 mm long; margins not winged 16
16a. Flowers yellow; petals 2 mm long or more 9. Draba ellipsoidea
b. Flowers white; petals ca 1 mm long 17
17a. Plants flaccid, diffuse; racemes lax, few-flowered 18
b. Plants erect or ascending; racemes usually many -flowered 19
18a. Racemes 1 - 3 (-5)-flowered; petals 7 - 8 mm long; style ca 1.5 mm long 6. Draba cholaensis
b. Racemes usually (1-) 3 -10-flowered; petals ca 3 mm long; style ea 0.5 mm long or obscure 13. Draba gracillima
19a. Petals less than 3 mm long 20
b. Petals 3 mm long or more 21
20a. Racemes 25 or more flowered; petals ca 2 mm long; fruits oblong-ellipsoid, 5 - 8 x 2.5 (-3) mm; pedicels stout, longer than fruits 20. Draba nemorosa
b. Racemes (5-) 12 (-16)-flowered; petals ca 2.5 mm long; fruits sublinear or oblong-ellipsoid, 4 - 7 x 1 mm; pedicels slender, equal to or shorter than fruit 19. Draba melanopus
21a. Pedicels filiform; fruits linear, slightly obtuse, pilose, 8 - 20 x 2 mm 29. Draba stenocarpa
b. Pedicels stout; fruits ovoid or oblong-ovoid, acute, glabrous,5 - 10 x 2 - 2.5 mm 10. Draba eriopoda
22a. Flowers mostly white 31. Draba tibetica
b. Flowers yellowish white or yellow 23
23a. Fruiting scapes 4 - 8 cm long; fruits 3 - 4 x 1.5 (-20) mm 24
b. Fruiting scapes 6 - 20 cm long; fruits 5 - 10 x 1.5 (-2) mm 25
24a. Basal leaves largely ciliate with simple or furcate hairs; fruiting scapes ca 4 (-6) cm long; fruits ovoid- oblong, straight, glabrous; pedicels 4 - 6 mm long 2. Draba altaica
b. Basal leaves densely tomentose with short and stellate white hairs; fruiting scapes ca 8 cm long. tomentose; fruits ellipsoid-oblong, often twisted, puberulous; pedicels 2 - 4 mm long 12. Draba glomerata
25a. Fruits ovoid or oblong-ellipsoid, mostly twisted 17. Draba lasiophylla
b. Fruits linear-oblong or ellipsoid-lanceolate, flattened, rarely twisted 26
26a. Racemes conspicuously bracteate 16. Draba lanceolata
b. Racemes rarely bracteate below 27
27a. Leaves densely white tomentose 28
b. Leaves not as above 30
28a. Basal leaves petioled 33. Draba winterbottomii
b. Basal leaves sessile or subsessile 29
29a. Leaves 5 - 10 mm long; racemes 6 - 12-flowered; fruits tomentose 27. Draba sikkimensis
b. Leaves 2 - 3 mm long; racemes 2 - 5-flowered; fruits glabrous 7. Draba dasyastra
30a. Stems few-leaved, all parts substellately woolly 21. Draba oariocarpa
b. Stems many-leaved, all parts not substellately woolly 31
31a. Fruits up to 20 x 3 mm, linear-oblong 11. Draba falconeri
b. Fruits up to 5 x 3 mm, oblong-ovoid to ovoid-orbicular 32
32a. Scapes erect, 15 - 20-flowered; fruits glabrous, 6 - 10-seeded 18. Draba ludlowiana
b. Scapes serpentino-flexuous, 30 - 50-flowered; fruits pubescent, 12 - 16-seeded 28. Draba stenobotrys


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