The Jepson Manual: Higher Plants of California

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Names are linked to treatments from the Manual


Key to DRABA

N.B.: couplets are linked, e.g., 1. is linked to 1'.

  1. Annual (may germinate in winter); < 2500 m; styles generally << 0.2 mm
 
    2. Petals divided > 1/4 to base, white; leaves basal
D. verna
    2' Petals entire or divided < 1/8 to base, white or light yellow; leaves basal and generally also cauline
 
      3. Lowest pedicel > 2 × fruit; petals light yellow, not markedly smaller in lateral inflorescences
D. nemorosa
      3' Lowest pedicel < 2 × fruit; petals white, often smaller or 0 in lateral inflorescences
 
        4. Leaf generally dentate; fruits lanceolate to oblong, often loosely clustered; inflorescence axes generally hairy
D. cuneifolia
        4' Leaf generally entire (to slightly dentate); fruits ± linear, densely clustered; inflorescence axes glabrous
D. reptans
  1' Biennial to perennial herb; generally > 2000 m; styles generally conspicuous, generally > 0.2 mm (if shorter, go to 22. and 22')
 
    5. Longest styles > 1 mm; corolla yellow
 
      6. Stem hairs coarse; basal leaves generally > 10 mm; cauline leaves generally several; fruits generally > 30 per inflorescence, sometimes densely clustered
 
        7. Fruit (3)4–6 mm wide, not twisted, tip obtuse; Klamath Ranges, High Cascade Range
D. aureola
        7' Fruit (1.5)2–3(4) mm wide, generally twisted, tip acute; Transverse Ranges, Peninsular Ranges
D. corrugata
          8. Cauline leaves 3–15, often crowded; fruits densely clustered
var. corrugata
          8' Cauline leaves 0–3, not crowded; fruits sparsely clustered
var. saxosa
      6' Stem hairs generally 0 above or fine (except some D. howellii); basal leaves generally < 10 mm (except some D. howellii); cauline leaves generally 0 (or 1–3, bract-like); fruits generally < 30 per inflorescence, not densely clustered
 
        9. Leaf narrowly ovate, tip generally acute; fruit lanceolate, strongly twisted; seed wing 0; s High Sierra Nevada
D. sharsmithii
        9' Leaf oblanceolate to obovate, tip generally rounded; fruit elliptic to ovate, little twisted; seed winged (except D. howellii); Klamath Ranges, n Sierra Nevada
 
          10. Leaf with tangled, generally irregularly branched hairs on lower surface, hairs on margin long
D. pterosperma
          10' Leaf with non-tangled, generally 2–7-branched, generally stellate hairs (or glabrous) on lower surface, hairs on margin 0 or seldom long
 
            11. Seed wing 0; cauline leaves generally 1–3, bract-like; fruit generally hairy
D. howellii
            11' Seed wing wide; cauline leaves (or bracts) generally 0; fruit generally glabrous
 
              12. Leaf surface hairs generally 4–7-branched-stellate, margin glabrous; stems few–many from below; n High Sierra Nevada
D. asterophora var. macrocarpa
              12' Leaf surfaces glabrous, margin hairs 2–4-branched; stems 1–few from base; Klamath Ranges
D. carnosula
    5' Longest styles < 1 mm; corolla white to yellow
 
      13. Corolla yellow; leaves basal; stems ± cushion- or mat-forming; seeds generally > 1 mm
 
        14. Leaves entire to minutely dentate, not persistent, not densely overlapped; fruit narrowly lanceolate, hairs generally 0 or sparse, short
D. cruciata
        14' Leaves entire, persistent, densely overlapped; fruit generally ± ovate, hairs 0 or often some long
 
          15. Leaf obovate, thick, ± fleshy, generally > 3 mm wide
 
            16. Leaf hairs generally 4-branched-stellate, margin glabrous; seed winged
D. asterophora var. asterophora
            16' Leaf hairs simple or forked, generally prominent on margin; seed wing 0
 
              17. Herbage glabrous or sparsely hairy; fruit generally not wavy, not twisted
D. incrassata
              17' Herbage hairy; fruit often wavy or twisted
D. lemmonii var. lemmonii
          15' Leaf linear to oblanceolate, ± thin, 0.5–3 mm wide
 
            18. Leaf margin prominently stiff-hairy
 
              19. Leaf lower surface glabrous or sparsely short-branched-hairy
D. densifolia
              19' Leaf lower surface with long, branched hairs
D. paysonii var. treleasei
            18' Leaf margin glabrous (or hairs not very prominent)
 
              20. Stem hairs 0 or stellate; leaf hairs not bush-like, main axis obvious
D. oligosperma var. oligosperma
              20' Stem hairs bush-like; leaf hairs ± bush-like or stellate, main axis not obvious
 
                21. Fruit strongly compressed, generally twisted
D. sierrae
                21' Fruit swollen at base, not twisted
D. subumbellata
      13' Corolla generally white to cream-colored (except D. albertina); leaves basal and generally also cauline; stems sometimes ± tufted (not mat-forming); seeds generally < 1 mm
 
        22. Stellate hairs with 4 or fewer branches
 
          23. Leaf lower surface with forked and cross-shaped hairs; corolla yellow; stem 1–40 cm; fruits 4–20 mm, not in umbel-like clusters; seed 0.7–1 mm
D. albertina
          23' Leaf lower surface with simple and forked hairs; corolla white; stem < 10 cm; fruits 3–5 mm, in umbel-like clusters; seed 0.6–0.8 mm
D. monoensis
        22' Some stellate hairs with > 4 branches
 
          24. Fruit linear, generally > 10 mm, 1–2 mm wide
D. lonchocarpa var. lonchocarpa
          24' Fruit narrowly lanceolate to oblong or ± ovate, generally < 10 mm, generally > 2 mm wide
 
            25. Leaf lower surface with 4–8-branched, stellate hairs, generally gray-green; lower pedicels > 3 mm, ascending; fruit not twisted, glabrous or hairs simple and forked
 
              26. Stem < 10(15) cm, with fruit ± throughout; cauline leaves overlapped
D. californica
              26' Stem 10–35 cm, with fruit only above middle; cauline leaves not overlapped
D. praealta
            25' Leaf lower surface with dense, many-branched, stellate hairs, generally whitish; lower pedicels generally < 3 mm, appressed; fruit twisted or not, with generally > 3-branched, stellate hairs
 
27' Cauline leaves generally entire; lower flowers not bracted
D. breweri
  27. Cauline leaves toothed; lower flowers generally bracted
D. cana


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