416 



FABACEAE. 



Vol. il. 



9. Lathyrus latifolius L. Everlasting 

 Pea. Fig. 2632. 



Lathyrus latifolius L. Sp. PI. 733- I753- 



Perennial, glabrous; stems high-climbing, 

 broadly winged, 3° long or more. Stipules 

 lanceolate, acute, often i' long; petioles as 

 long as the stipules or longer, winged like the 

 stem; leaflets a single pair, oblong-lanceolate 

 to elliptic, strongly veined, 2-4' long, acute or 

 mucronate ; tendril branched ; peduncles stout, 

 curved, mostly longer than the leaves; flowers 

 purple, racemose, purple to white, nearly i' 

 long. 



Escaped from cultivation, Connecticut to Dis- 

 trict of Columbia. Native of Europe. Summer. 



Lathyrus tuberosus L., another perennial Old 

 World species, with purple flowers, but with 

 smaller thin leaflets and smaller flowers has been 

 found in grassy places in Ontario, Vermont and 

 eastern Massachusetts. 



10. Lathyrus pusillus Ell. Low 

 Vetchling. Fig. 2633. 



L. pusillus Ell. Bot. S. C. & Ga. 2 : 223. 1823. 



Annual, glabrous ; stems usually branch- 

 ed near the base, spreading or climbing, 

 narrowly 2-winged, 2° long or less. 

 Leaflets a single pair, linear to linear- 

 oblong, acute, i'-2i' long, with a fili- 

 form often 3-forked tendril between 

 them ; stipules lanceolate, slightly curved, 

 auricled at the base, as long as the pe- 

 tiole or shorter; peduncles 2' long or 

 less, 1-2-flowered ; flowers purple, 2!"- 

 3*" long, short-pedicelled ; calyx-lobes 

 narrowly lanceolate, acuminate, as long 

 as the tube or somewhat longer; pods 

 linear, I'-iF long. 



Sandy soil, North Carolina to Florida, 

 Missouri, Kansas and Texas. April-May. 



42. CLITORIA L. Sp. PI. 753. 1753. 



Woody vines, or erect or climbing herbs, with pinnately 3-folioIate (sometimes 5-9-folio- 

 late) leaves, persistent stipules, and large showy axillary solitary or racemose flowers. Calyx 

 tubular, s-toothed, the 2 upper teeth more or less united. Standard large, erect, retuse, nar- 

 rowed at the base, not spurred ; wings oblong, curved ; keel acute, shorter than the wings. 

 Stamens more or less monadelphous ; anthers all alike. Ovary stipitate ; style elongated, 

 incurved, hairy along the inner side. Pod stalked in the calyx, linear or linear-oblong, flat- 

 tened, 2-valved, partly septate between the seeds. 



About 30 species, natives of warm and temperate regions. The following is the only one known 

 to be native in North America. Type species : Clitoria Ternatea L., which is naturalized in Florida. 



