2 NORTH AMERICAN FLORA [Volume 24 



Ovary 2-6-ovuled. 



Filaments distinct, or united only at the base; corolla wanting or reduced 

 to the banner only. 

 Banner wanting; stamens free. 10. Parryella. 



Banner present; stamens united at the base. 11. Amorpha. 



Filaments united more than half their length into an elongate tube split 

 on the upper side; corolla usually present. 

 Pod flat, exserted; stamens diadelphous. 12. Eysenhardtia. 



Pod turgid; stamens monadelphous. 



Corolla scarcely papilionaceous; petals all free and nearly claw- 

 less; stipules spinescent. 13. Psorobatus. 

 Corolla papilionaceous; petals clawed and those of the keel usually 

 adnate or coherent. 

 Pod exserted; flowers pedicelled. 14. Psorodendron. 

 Pod not exserted; flowers sessile. 15. Psorothamnus. 

 Petals, except the banner, adnate to or inserted on the staminal tube. 



Wings and keel-petals distinctly clawed, inserted some distance below the 

 mouth of the staminal tube, the keel-petals (if present) inserted higher 

 up than the wings, the former usually united along the lower edge of the 

 blades. 16. ParosELa. 



Wings and keel-petals alike, clawless or short-clawed, all distinct and in- 

 serted at the mouth of the staminal tube; spikes dense, with persistent 

 bracts. 

 Stamens 10, rarely 9. 17. ThornbeRa. 



Stamens 5. 



Banner much broader than the other petals; calyx-lobes not much 



if at all exceeding the tube; spikes not involucrate. 18. Petalostemon. 



Banner similar to the other petals but long-clawed; calyx -lobes about 

 3 times as long as the tube, plumose; spikes involucrate, i. e., sub- 

 tended by many conspicuous empty bracts. 19. KuhnisTERA. 



1. PSORALEA* (Royen) L,. Sp. PI. 762. 1753. 



Rutenia Medic. Vorles. Churpf. Phys.-Oek. Ges. 2: 381. 1787. 



Shrubs, with densely leafy stems, conspicuously glandular-dotted. Leaves odd-pinnate 

 with a sessile terminal leaflet or 3-foliolate, often with spinulose-tipped leaflets. Flowers axil- 

 lary or in terminal sessile spikes, never in axillary long-peduncled spikes or racemes. Calyx 

 usually strongly glandular-punctate and strongly ribbed, 5-lobed; tube campanulate, not 

 gibbous; lobes elongate, subequal or the lowest one longer. Corolla usually longer than the 

 calyx; petals conspicuously veined; banner distinct, broadly obovate.with the margins recurved- 

 spreading, the blade usually bearing two more or less distinct rounded basal lobes above the 

 short, narrow, straight or nearly straight claw; wings about as long as the banner; blades ob- 

 liquely oblong or oblanceolate, with a basal lobe on the upper side, usually longer than the 

 slender free claw; keel-petals shorter than the wings, the claws free, the blades broadly lunate, 

 with a less distinct basal lobe, united only at the rounded apex, each slightly united with the 

 blade of the adjacent wing at the base. Filaments of nine of the stamens united to near the 

 apex into a 9-toothed tube, the alternate teeth usually shorter, the tenth filament either free 

 except at the very base, or united with the tube high up, or wanting. Pod oval, or ovate, 

 indehiscent, short-beaked, the pericarp free from the seed. Seed more or less kidney-shaped, 

 smooth. 



Type species, Psoralea pinnala L- 



1. Psoralea fruticans (L.) Rydberg. 



Tn 'folium fruticans L. Sp. PI. 770. 1753. 



Psoralea bracteata L. Mant. 264. 1771. 



Psoralea fruticosa Kellogg. Proc. Calif. Acad. 7: 91. 1877. 



Lolodes fruticans Kuntze, Rev. Gen. 194. 1891. 



A low shrub, erect or decumbent, densely leafy; twigs subcanescent ; leaves digitately 

 3-foliolate; stipules 1 cm. long, lanceolate, acuminate, striate; petioles very short; leaflets 

 broadly obovate, retrorsely spinulose-mucronate, 1-2.5 cm. long, conspicuously punctate, 

 pubescent or in age glabrate; spikes terminal, sessile, densely-flowered, subcapitate; bracts 

 membranous, lanceolate or ovate, acuminate, nearly as long as the flowers; calyx densely 

 pubescent and glandular; tube 3 mm. long; lobes lanceolate, acute, 4 mm. long, the lowest 

 slightly longer than the rest; corolla purple-blue, or whitish, or the banner purple and wings 



* Also spelled Psoralia. 



