| 1 |
Cauline leaves usually petiolate, rarely sessile, blades with bases not auriculate, sagittate, or amplexicaul |
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(2) |
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Cauline leaves sessile, blades with bases auriculate, sagittate, or amplexicaul |
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(6) |
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| 2 (1) |
Middle cauline leaf blades: margins runcinate- or lyrate-pinnatifid; fruits 3.5-5 mm wide |
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(3) |
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Middle cauline leaf blades: margins entire or repand; fruits 1.2-3.2(-3.5) mm wide |
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(4) |
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| 3 (2) |
Stems glabrous proximally; petals unequal (abaxial pair 5-6 mm, adaxial pair 15- 26 mm); stamens in 3 unequal pairs; styles 0.2-0.5 mm. |
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12 Streptanthus cutleri |
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Stems pilose proximally; petals equal (4-8 mm); stamens tetradynamous; styles 0.5-2.7 mm. |
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29 Streptanthus petiolaris |
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| 4 (2) |
Perennials; middle cauline leaves spatulate-obovate to suborbicular; filament pairs distinct; fruits 2.5-3.2(-3.5) mm wide. |
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21 Streptanthus howellii |
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Annuals; middle cauline leaves usually linear to linear-lanceolate, rarely oblanceolate; filament pairs connate; fruits 1.2-2 mm wide |
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(5) |
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| 5 (4) |
Calyces urceolate; petals 6-9 mm; ovules 22-38 per ovary; California. |
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2 Streptanthus barbiger |
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Calyces campanulate; petals 13-20 mm; ovules 90-120 per ovary; Arkansas, Kansas, Louisiana, Oklahoma, Texas. |
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22 Streptanthus hyacinthoides |
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| 6 (1) |
Racemes bracteate throughout or partly |
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(7) |
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Racemes ebracteate throughout |
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(14) |
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| 7 (6) |
Racemes bracteate throughout or proximalmost flowers bracteate; Texas |
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(8) |
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Racemes bracteate below or between proximalmost 1 or 2 flowers; California, Nevada, Oregon |
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(9) |
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| 8 (7) |
Petals 14-19 mm; stamens tetradynamous; fruits 8-14.5 cm × 2.5-4 mm; ovules 48-80 per ovary; styles 1-3.5 mm. |
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6 Streptanthus bracteatus |
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Petals 16-27 mm; stamens in 3 unequal pairs; fruits 4-9.5 cm × 4.5-6 mm; ovules 26-42 per ovary; styles 0.5-2 mm. |
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30 Streptanthus platycarpus (in part) |
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| 9 (7) |
Basal leaf blades pectinate, 1- or 2-pinnatifid, or pinnatisect; fruits smooth or slightly torulose |
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(10) |
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Basal leaf blades not pectinate, pinnatifid, or pinnatisect (not lobed); fruits torulose |
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(12) |
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| 10 (9) |
Middle cauline leaf blades pectinate or pinnatisect into filiform segments, bases not auriculate; fruits geniculately reflexed. |
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13 Streptanthus diversifolius |
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Middle cauline leaf blades usually not lobed, rarely pinnatifid, not forming filiform segments, bases auriculate; fruits usually ascending or divaricate, rarely reflexed |
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(11) |
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| 11 (10) |
Petals white (veins violet); fruits 6-12 cm × 1.7-2.5 mm, valves each with prominent midvein; ovules 60-100 per ovary; seeds 2-2.5 × 1.5-2 mm. |
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15 Streptanthus farnsworthianus |
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Petals rose-purple; fruits 2-5 cm × 1.2-1.7 mm, valves each with obscure midvein; ovules 22-38 per ovary; seeds 1-1.5 × 0.7-0.9 mm. |
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16 Streptanthus fenestratus |
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| 12 (9) |
Annuals; sepals 4-5 mm; fruiting pedicels not expanded at receptacles. |
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18 Streptanthus gracilis |
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Biennials or perennials (short-lived); sepals 6-10(-13) mm; fruiting pedicels expanded at receptacles |
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(13) |
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| 13 (12) |
Cauline leaf blades linear-lanceolate; filaments: adaxial pair connate, 13-16 mm, lateral pair 7-9 mm; Trinity County, California. |
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27 Streptanthus oblanceolatus |
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Cauline leaf blades oblong to obovate or suborbicular; filaments: adaxial pair distinct, (5-)7-11 mm, lateral pair (1.5-)3-5 mm; California, Nevada, Oregon. |
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33 Streptanthus tortuosus |
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| 14 (6) |
Racemes with terminal cluster of sterile flowers; fruit valves sparsely to densely hirsute or hispid |
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(15) |
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Racemes without terminal cluster of sterile flowers; fruit valves glabrous (sometimes hirsute in S. glandulosus) |
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(17) |
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| 15 (14) |
Petals purple (with dark purple veins), claws narrower than blades; fruits 1.3-2.5 cm × 2.5-3.5 mm; seeds not winged; Santa Clara County, California. |
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8 Streptanthus callistus |
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Petals purple (with white margins), purplish white, lemon-yellow, or yellowish white, claws as wide as or wider than blades; fruits 3.5-11.4 cm × 1.5-2.5 mm; seeds winged (wings continuous); Contra Costa, Fresno, Merced, Monterey, San Benito counties, California |
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(16) |
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| 16 (15) |
Middle cauline leaf blade bases not auriculate; filaments: abaxial pair connate; Mt. Diablo, Contra Costa County, California. |
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20 Streptanthus hispidus |
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Middle cauline leaf blade bases auriculate; filaments: abaxial pair distinct; Fresno, Merced, Monterey, San Benito counties, California. |
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23 Streptanthus insignis |
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| 17 (14) |
Perennials, with woody caudex (except S. campestris); calyces ± campanulate; filaments: adaxial pair distinct; anthers 2.5-5 mm, adaxial pair fertile |
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(18) |
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Annuals or biennials, without woody caudex; calyces often urceolate, sometimes campanulate; filaments: adaxial pair often connate, sometimes distinct; anthers 1-6 mm, adaxial pair often sterile, sometimes fertile |
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(23) |
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| 18 (17) |
Cauline leaves overlapping, not smaller distally; petals with darker veins, margins slightly crisped. |
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1 Streptanthus barbatus |
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Cauline leaves not overlapping, smaller distally; petals without darker veins, margins not crisped |
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(19) |
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| 19 (18) |
Fruits descending, arcuate; petals purple or brownish with yellow-green claws. |
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24 Streptanthus longisiliquus |
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Fruits spreading, divaricate-ascending, or ascending, straight or slightly curved; petals uniformly white, maroon-purple, or brownish, rarely claws yellow (S. campestris) |
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(20) |
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| 20 (19) |
Petals: claws white or pale yellow; stamens tetradynamous or nearly so; fruit valves each with obscure midvein |
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(21) |
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Petals: claws purplish; stamens in 3 unequal pairs; fruit valves each with prominent midvein |
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(22) |
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| 21 (20) |
Plants with woody caudex (elevated); stems 2.5-8.6 dm; racemes lax in bud; sepals pale yellow to white; stigmas subentire. |
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4 Streptanthus bernardinus |
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Plants without woody caudex; stems (2.5-)6-15(-18) dm; racemes dense in bud; sepals purple; stigmas 2-lobed. |
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9 Streptanthus campestris |
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| 22 (20) |
Basal leaf blades: margins dentate, petioles broadly winged; fruits (2.5-)3-6(-7) mm wide; stigmas slightly to strongly 2-lobed; ovules 20-38(-46) per ovary; seeds 2.5-5 × 2.2-5 mm. |
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11 Streptanthus cordatus |
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Basal leaf blades: margins entire, petioles usually not winged, rarely narrowly winged; fruits 2-2.7(-3) mm wide; stigmas entire; ovules (42-)48-60 per ovary; seeds 2-2.5(-2.7) × 1.5-2 mm. |
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28 Streptanthus oliganthus |
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| 23 (17) |
Calyces usually campanulate, rarely urceolate; filaments: adaxial pair distinct; anthers: adaxial pair fertile; stigmas strongly 2-lobed |
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(24) |
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Calyces urceolate; filaments: adaxial pair connate; anthers: adaxial pair sterile; stigmas entire or subentire |
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(27) |
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| 24 (23) |
Stamens in 3 unequal pairs; fruits 4.5-6 mm wide; ovules 26-54 per ovary; seeds 3-5 mm wide |
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(25) |
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Stamens tetradynamous; fruits 2-3 mm wide; ovules 54-92 per ovary; seeds 1-1.3 mm wide |
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(26) |
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| 25 (24) |
Petals creamy white (with purple veins) or purple with white margins, 14-18 mm, margins crisped, 1-1.5 mm wide; fruit valves each with obscure midvein; Arizona, New Mexico, Texas. |
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10 Streptanthus carinatus |
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Petals lavender or purplish lavender, 16-27 mm, margins not crisped, 6-9 mm wide; fruit valves each with prominent midvein; Texas. |
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30 Streptanthus platycarpus (in part) |
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| 26 (24) |
Sepals glabrous, lateral pairs usually without, rarely with, subapical callus, 0.1-0.3 mm. |
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25 Streptanthus maculatus |
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Sepals hirsute, lateral (and median) pairs with subapical callus, 1-2 mm. |
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32 Streptanthus squamiformis |
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| 27 (23) |
Replums constricted between seeds |
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(28) |
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Replums not constricted between seeds (straight) |
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(30) |
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| 28 (27) |
Annuals; basal leaves not rosulate, blade not mottled; sepals green; petals without darker veins. |
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34 Streptanthus vernalis |
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Biennials; basal leaves rosulate, blade mottled; sepals rose-purple, yellow, or violet; petals with darker veins |
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(29) |
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| 29 (28) |
Stems 1.4-5(-6) dm, usually branched basally, rarely unbranched; petals whitish, abaxial pairs with purple spot, adaxial pairs with faint purple veins; fruit valves each with obscure midvein. |
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5 Streptanthus brachiatus |
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Stems (2.5-)6.5-12(-15) dm, unbranched or paniculately branched distally; petals creamy white, abaxial and adaxial pairs with brownish purple veins; fruit valves each with prominent midvein. |
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26 Streptanthus morrisonii |
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| 30 (27) |
Sepals: abaxial ovate-cordate, lateral ovate-lanceolate, adaxial pair suborbicular to broadly ovate-cordate (forming a bannerlike hood), adaxial pair distinctly larger than abaxial and lateral sepals; fruits pendent. |
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31 Streptanthus polygaloides |
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Sepals: all lanceolate to broadly ovate (not forming a bannerlike hood), subequal; fruits usually erect, ascending, divaricate, or spreading (rarely reflexed in S. glandulosus) |
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(31) |
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| 31 (30) |
Middle cauline leaf blades orbicular or orbicular-ovate, strongly overlapping; fruits strongly falcate. |
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14 Streptanthus drepanoides |
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Middle cauline leaf blades ovate, oblanceolate, lanceolate, or linear, not overlapping; fruits straight, curved, or arcuate |
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(32) |
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| 32 (31) |
Plants usually hirsute basally, rarely glabrous; petals with crisped margins; fruit valves each with prominent midvein, glabrous or sparsely to moderately hirsute. |
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17 Streptanthus glandulosus |
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Plants glabrous basally; petals without crisped margins; fruit valves each with obscure midvein, glabrous |
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(33) |
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| 33 (32) |
Basal leaf blades: margins entire; middle cauline leaf blades linear to narrowly linear-lanceolate; petals 2-3 mm wide. |
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35 Streptanthus vimineus |
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Basal leaf blades: margins usually dentate (S. breweri sometimes entire); middle cauline leaf blades ovate or lanceolate; petals 1-2 mm wide |
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(34) |
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| 34 (33) |
Petals: abaxial pair purplish; filaments: adaxial pair 5-6 mm; fruits 1.3-3 cm; ovules 12-22 per ovary. |
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3 Streptanthus batrachopus |
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Petals: abaxial pair white (with purple veins); filaments: adaxial pair 6-10 mm; fruits 3-9 cm; ovules 24-54 per ovary |
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(35) |
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| 35 (34) |
Foliage green; rachises straight; petals 8-12 mm; fruits strongly arcuate (recurved). |
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7 Streptanthus breweri |
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Foliage mostly yellowish; rachises flexuous; petals 6-8 mm; fruits usually nearly straight, rarely arcuate. |
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19 Streptanthus hesperidis |
