Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Streptanthus

View taxon page for Streptanthus

(For a list of species in Streptanthus, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. All cauline leaves petioled or , base not lobed, , or clasping

2. Annual; mid-cauline leaves ± filaments of long stamen pairs fusedfruit 1.2–2 mm wide ..... S. barbiger

2' Perennial herb; mid-cauline leaves round to broadly obovate; all filaments free; fruit 2.5–3.2(3.5) mm wide ..... S. howellii

1' Middle or distal cauline leaves sessile, base lobed, sagittate, or clasping

3. Raceme bracted at least below most proximal flowers

4. Basal, proximal cauline leaves 1–2-pinnately lobed or divided; fruit not constricted between seeds (± constricted)

5. Mid-cauline  base not lobed, pinnately divided into thread-like segments; fruit abruptly  at stalk above receptacle ..... S. diversifolius

5' Mid-cauline leaf base lobed to  or  (pinnately lobed, not thread-like-segmented); fruit  to  (reflexed).

6. Fruit 6–12 cm, 1.7–2.5 mm wide,  midvein distinct; seeds 60–100, 2–2.5 mm; petals white, veins violet ..... S. farnsworthianus

6' Fruit 2–5 cm, 1.2–1.7 mm wide, valve midvein obscure; seeds 22–38, 1–1.5 mm; petals rose-purple ..... S. fenestratus

4' Basal, proximal cauline leaves entire, wavy, dentate, or ± lobed; fruit generally constricted between seeds

7. Annual; sepals 4–5 mm;  not expanded at receptacle ..... S. gracilis

7' Biennial or short-lived  herb; sepals 6–10(13) mm; pedicel expanded at receptacle

8. Mid-cauline leaves lance-linear; longest filament pair fused, 13–16 mm; short filaments 7–9 mm ..... S. oblanceolatus

8' Mid-cauline leaves  to obovate or ± round; longest filament pair free, (5)7–11 mm; short filaments (1.5)3–5 mm ..... S. tortuosus

3' Raceme not bracted

9. Raceme with terminalsterile flower cluster; fruit sparsely to densely stiff-hairy

10. Fruit 1.3–2.5 cm, 2.5–3.5 mm wide; seeds wingless; petals purple, veins darker, proximal 1/2 narrower than ; Mount Hamilton Range, Santa Clara Co. ..... S. callistus

10' Fruit 3.5–11.4 cm, 1.5–2.5 mm wide; seeds winged; petals purple with white margins, ± purple-white, lemon-yellow, or ± yellow-white, proximal 1/2 at least as wide as blade; not Mount Hamilton Range

11. Mid-cauline leaf base not lobed; long filament pairs fused; Mount Diablo, Contra Costa Co. ..... S. hispidus

11' Mid-cauline leaf base lobed; only longest filament pair fused; Fresno, Merced, Monterey, San Benito cos. ..... S. insignis

12. Sepals of fertile flowers ± purple; terminal sterile flower cluster dark purple; petals ± purple-white; fruit sparsely (densely) stiff hairy ..... subsp. insignis

12' Sepals of fertile flowers ± green-yellow or ± purple; terminal sterile flower cluster pale yellow, ± green-yellow, or ± purple; petals lemon yellow or ± yellow-white; fruit moderately to densely stiff hairy ..... subsp. lyonii

9' Raceme terminal sterile flower cluster 0; fruit generally glabrous

13. Perennial herb,  generally woody; all stamens fertile, free; calyx ± bell-shaped; anthers 2.5–5 mm

14. Distal leaves ± same size as mid-cauline; petals darker-veined, ± crinkled ..... S. barbatus

14' Distal leaves smaller than mid-cauline; petals not darker-veined, not crinkled

15. Fruit descending, petal proximal 1/2 yellow-green, blades purple or ± brown ..... S. longisiliquus

15' Fruit spreading to ascending, straight or ± curved; petals generally all white, yellow, purple, or ± brown

16. Stamens 4 long, 2 short; fruit valve midveins obscure at least near tip; petal proximal halves white or pale yellow

17. Sepals pale yellow to white; stigma ± unlobed; racemes open in stem 2.5–8.6 dm; woody caudex elevated ..... S. bernardinus

17' Sepals purple; stigma 2-lobed; racemes dense in bud; stem (2.5)6–15(18) dm; woody caudex 0 ..... S. campestris

16' Stamens in 3 pairs of unequal length; fruit valve midveins distinct; petal proximal halves ± purple

18. Basal leaves entire,  wingless (narrowly winged); fruit 2–2.7(3) mm wide; stigma unlobed; seeds (42)48–60, 2–2.5(2.7) mm, 1.5–2 mm wide ..... S. oliganthus

18' Basal leaves dentate, petiole broadly winged; fruit (2.5)3–6(7) mm wide; stigma ± unlobed to 2-lobed; seeds 20–38(46), 2.5–5 mm, 2.2–5 mm wide ..... S. cordatus

19. Mid-cauline leaves broadly oblong to  or ± round, tips ± rounded to  leaves obovate to spoon-shaped, tips obtuse or round ..... var. cordatus

19' Mid-cauline leaves , tips  to ; basal leaves narrowly oblanceolate, tips acuminate ..... var. piutensis

13' Annual or biennial, woody caudex 0; longest stamens sterile, occasionally fertile, filaments fused, occasionally free; calyx urn- or occasionally bell-shaped; fertile anthers 1–2.5(3) mm

20. Fruit placenta constricted between seeds; generally biennial

21. Annual; basal leaves not rosetted, not mottled; sepals green; petal blade not darker-veined ..... S. vernalis

21' Biennial; basal leaves rosetted, generally mottled; sepals rose-purple, yellow, or violet; petal blade darker-veined

22. Stem 1.4–5(6) dm, generally branched at base; fruit valve midveins obscure; petals ± white, adaxial pair ± purple-veined, abaxial pair with purple spot ..... S. brachiatus

22' Stem (2.5)6.5–12(15) dm, generally branched distally; fruit valve midveins distinct; petals creamy white, veins brown-purple ..... S. morrisonii

20' Fruit placenta straight; annual

23. Upper sepal ± round to broadly ovate-cordate, forming banner-like hood, distinctly larger than other sepals; fruit pendent ..... S. polygaloides

23' Sepals lanceolate to broadly ovate, not banner-like, ± equal; fruit  to ascending or spreading (reflexed).

24. Mid-cauline leaves round to broadly ovate; fruit strongly curved ..... S. drepanoides

24' Mid-cauline leaves ovate to oblanceolate, lanceolate, or linear; fruit straight to curved

25. Calyx ; plant glabrous near base; fruit valves glabrous, midvein obscure; petals not crinkled

26. Mid-cauline leaves linear to narrowly lance-linear; basal leaves entire; petal blade 2–3 mm wide ..... S. vimineus

26' Mid-cauline leaves ovate to lanceolate; basal leaves dentate or entire; petal blade 1–2 mm wide

27. Lower petals ± purple; longest filaments 5–6 mm; fruit 1.3–3 cm; seeds 12–22 ..... S. batrachopus

27' Lower petals white, purple-veined; longest filaments 6–10 mm; fruit 3–9 cm; seeds 24–54

28. Raceme axis straight; leaves glaucous-green; petals 8–12 mm; fruit generally strongly arched or recurved ..... S. breweri

28' Raceme axis wavy; leaves ± yellow; petals 6–8 mm; fruit generally straight (recurved) ..... S. hesperidis

25' Calyx ; plant basally stiff-hairy (glabrous); fruit valves sparsely to moderately hairy or glabrous, midvein distinct; petals crinkled ..... S. glandulosus

29. Pedicel 1–3.2 cm; sepals dark purple-black;  axis wavy; proximal cauline leaves glabrous ..... subsp. niger

29' Pedicel 0.2–1.5 cm; sepals not dark purple-black; raceme axis straight; proximal cauline leaves generally sparsely to densely stiff-hairy (glabrous)

30. Raceme not 1-sided

31. Sepals white to ± green-white or pale yellow; Santa Clara Co. ..... subsp. albidus

31' Sepals ± red-purple to dark maroon or lilac-lavender; San Luis Obispo Co. n to Santa Clara, Lake, Mendocino cos. ..... subsp. glandulosus

30' Raceme 1-sided

32. Sepals lavender to rose or purple

33. Pedicel 5–15 mm; fruit curved downward, spreading to reflexed; longest filaments 7–10 mm; Sonoma Co. ..... subsp. hoffmanii

33' Pedicel 2–5 mm; fruit curved upward, spreading to ascending; longest filaments 6–8 mm; Marin Co. ..... subsp. pulchellus

32' Sepals ± green-white to cream or pale yellow

34. Sepals ± green-white, base lavender to ± purple; petals purple-veined; Marin, Napa cos. ..... subsp. secundus

34' Sepals cream or pale yellow, base not ± purple to lavender; petals not purple-veined; Sonoma Co. ..... subsp. sonomensis



Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, [accessed on ]

Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .

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