104 LEGUMINOS^E. (PULSE FAMILY.) 



oblong, mucronate-pointed ; stipules small, lanceolate, half arrow-shaped, sharp- 

 pointed at both ends ; peduncles 3 - 5-flowered ; corolla bine-purple. Moist 

 places, N. England to Penn., Illinois, and northward. July. (Eu.) 



Var. myrtifolius. Taller, climbing 2 - 4 high ; leaves oblong or 

 ovate-elliptical; upper stipules larger: corolla pale purple. (L. myrtifolius, 

 Muhl.) \V. New England to Penn., and northward. 



L. LATiF6Lius (EVERLASTING PEA) and L. ODORATUS (SWEET PEA) 

 are commonly cultivated species. 



PISOM SATIVUM, the PEA ; FABA VULG\RIS, the HORSE-BEAN , and ClcEK 

 ARIET!NUM, the CHICK-PEA, are other cultivated representatives of the same 

 tribe. 



22. PHASEOLUS, L. KIDNEY BEAN. 



Calyx 5-toothed or 5-cleft, the 2 upper teeth often higher united. Keel of the 

 corolla, with the included stamens and style, spirally coiled or twisted, or curved 

 into a ring. Stamens diadelphous. Pod linear or scythe-shaped, several - 

 many-seeded, tipped with the hardened base of the style. Cotyledons thick 

 and fleshy, rising out of the ground nearly unchanged in germination. Twin- 

 ing or prostrate herbs, with pinnately 3-foliolate stipellate leaves. Flowers 

 often clustered on the knotty joints of the raceme. (The ancient name of the 

 Kidney Bean.) 



* Pods scymetar-shaped : racemes long and loose, panicled. 



1. P. percnnis, Walt. (WILD BEAN.) Stem climbing high; leaflets 

 roundish-ovate, short-pointed ; pods drooping, strongly curved, 4 - 5-seedcd. 1J. 



Copses, Connecticut to Illinois, and southward. Aug. Flowers purple, 

 handsome, but small. 



# # Pods long and straight, linear, rather terete: flowers few in a short clustered ra- 



ceme like a head. ( Strophostyles, Ell.) 



2. P (liversifolillS, Pers. Annual; stem prostrate, spreading, rough- 

 hairy ; leaflets ovate-3-lobed, or angled towards the base, or some of them oblong- 

 ovate and entire ; peduncles at length twice the length of the leaves. Sandy 

 fields and banks, Massachusetts to Illinois and southward. July, Aug. Corol- 

 la greenish-white tinged with red or purple. Pod tliickish. 



3. P. liclvolllS, L. Perennial, hairy ; stems diffuse, slender ; leafleU 

 ovate or oblong, entire or obscurely angled ; peduncles 3-6 times tlie length of the leave* 



Sandy fields, S. New York to Illinois and southward. Aug. More slender 

 than the last : pods narrower : flowers as large and similar. 



* * Pods straight and linear, flat: peduncles 1 -few-flowered at the summit : flowers 



small : keel slightly twisted. 



4. P. pauciflorus, Benth. Annual ; stems diffuse, but twining, slen- 

 der, pubescent ; leaflets varying from oblong-lanceolate or ovate-oblong to linear. 

 (P. leiospermus, Torr. Sf Gr.) River-banks, Illinois (Mead) and sonthwest- 

 ward. July- Sept. Flowers 3" long, purple. Pod 1' long, pubescent. 



P. VULGXRIS is the common KIDNEY BEAN or HARICOT. 

 P. LTTNATUS is the LIMA BEAN of our gardens. 



