NORTH AMERICAN FLORA 



[Volume 24 



Subgenus 2. EUPAROSELA. Flowers spicate or subcapitate, ascending, sessile in the 

 axils of the bracts, which are usually more persistent than in the preceeding subgenus. (Dalea 

 Vent. Cylopogon Raf. Jamesia Raf.). 



Annuals. 



Calyx-lobes subulate-tipped, at least half as long as the tube. 

 Plant not sericeous. 



Staminal tube long-exserted, about twice as long as 



the calyx-tube. 

 Staminal tube not long-exserted. 



Calyx-tube slit deeper on the back. 



Keel-petals wanting; calyx-tube slit to near the 



base; stamens usually only 7 or 8. 

 Keel-petals present; calyx-tube slit about half 

 its length; stamens 9 or 10. 

 Calyx-tube not slit deeper on the back. 

 Corolla purple to white. 

 Corolla ochroleucous. 

 Plant sericeous-tomentose. 

 Calyx-lobes triangular or broadly deltoid, less than half as 

 long as the tube. 

 Bracts not keeled, short-acuminate or acute; calyx-tube 



short-cam panulate or turbinate. 

 Bracts keeled, boat-shaped, abruptly long acuminate; 

 calyx-tube deeply campanulate or urceolate. 

 Perennials. 



Calyx-lobes short, ovate or lanceolate, usually much shorter 

 than the tube, rarely subulate-tipped. 

 Corolla yellow. 



Low shrubs with subcapitate inflorescence and broad 



firm bracts; corolla fading yellow; leaflets small. 

 Tall shrubs with elongate inflorescence; bracts thin, 

 caducous; corolla fading purple; leaflets large. 

 Corolla (except sometimes the banner) not yellow. 



Bracts enclosing the flowers, abruptly contracted into 

 a filiform acumination; calyx membranous, glabrous 

 or slightly pubescent. 

 Bracts at most concave, neither enclosing the flowers 

 nor abruptly caudate-acuminate (except in CiT- 

 riodorae). 

 Corolla wholly or partly purple, pink, or blue (in P. 

 psoraleoides and P. longifolia fading cream- 

 colored) . 

 Calyx glabrous or slightly silky-strigose without, 

 ciliolate on the margins; lobes broader than 

 long. 

 Calyx pubescent without, at least the lobes, 

 which are longer than broad. 

 Leaflets large, 1-2 cm. long, acute at each 



end; corolla yellow at first. 

 Leaflets small, rarely 1.5 cm. long, obtuse; 

 wings and keel always purple, pink, or 

 blue. 

 Corolla blue. 



Plant glabrous. 

 Plant pilose. 

 Corolla (except sometimes the banner) 

 purple or pink. 

 Banner yellow or white. 



Branches conspicuously glandular - 



tuberculate; spikes single. 

 Branches not conspicuously gland- 

 ular-tuberculate. 

 Spikes more or less paniculate; 



leaflets canescent, few. 

 Spikes single; leaflets glabrous, 

 very numerous. {P. longi- 

 folia in) 

 Banner as well as the other petals 

 purple. 

 Leaflets very numerous, linear. 

 Leaflets not very numerous, ob- 

 long to oval or obovate. 

 Decumbent or prostrate herbs 

 with elongate lax spikes; 

 bracts conspicuously gland- 

 ular-punctate; keel - petals 

 apparently distinct. 



X. Lagopodes. 



XL TJrcEOLATaE. 



XII. POLYGONOIDES. 



XIII. Alopecuroides. 



XIV. Flavae. 

 XV. Similes. 



XVI. CitriodoraE. 

 XVII. Unciferae. 



XVIII. Capitatae. 

 XX. Acutifoliae. 



XVII. Unciferae. 



XIX. Frutescentes. 



XX. Acutifoliae. 



XXI. CyanEaE. 

 XXIV. Pilosissimae. 



XXII. TuberculataE. 



XXIII. Psoraleoides. 

 XXXIV. Crassifoliae. 

 XXV. PectinataE. 



XXVI. Arenariae. 



