286 CLASS XVII. ORDER IV. 



A small, hairy plant with turgid pods. Stem from four to 

 eight inches high, branching. Leaves alternate, sessile, oblong 

 or lanceolate. Stipules opposite and decurrent, so that the pair 

 appear inversely sagittate. Calyx segments long, lanceolate, 

 acuminate, hairy. Corolla small, yellow. Legume shortly stip- 

 itate, oblong, inflated, few seeded. — Dry grounds. — Cambridge. 

 — July. — Annual. 



311. PHASEOLUS. 

 Phaseolus trilobus Mx. Three lobed Bean Vine. 



Twining, pubescent, lower leafets rhomboid-oval, 

 upper ones three lobed; heads on long stalks; legumes 

 linear. 



Stem twining, angular. Stipules oblong. Leaves ternate, 

 the leafets broad, ovate, entire, the upper ones, especially the 

 term.inal one, three lobed. Peduncles longer and larger than 

 the petioles, with a head of flowers. Banner spreading, while 

 tinged with reA; wings small, whitish; keel slightly twisted, 

 tipt with purple. Legumes linear. — South Boston. — July. — 

 AnnuaL 



312. LATHYRUS. 



Lathyrus maritimi;s. Beach Pea. 



L. caule co?7ip)'esso, tetragono ; stlpidls sagittatis ; 

 foUolis nuinerosis, subalternis, obovatis ; pediinculis 

 folio brevioribus, siibseptenrfloris. 



Stem compressed, four angled; stipules sagittate; 

 leafets numerous, subalternate, obovate ; peduncles 

 shorter than the leaves, about seven flowered. 



Syn. PisUM MARiTiMUM. Pursh. 



Lathyrus pisiformis. Hooker. 

 This plant, w^hich has very much the habit and aspect of a 

 pea, is only found on the borders of the beach and salt marsh, 

 whence it has been usually taken for the Pisum maritimwn of 

 Europe, with which it may be identical. It is, however, decid- 

 edly a Lathyrus. The whole plant has a glaucous aspect.. 



