Lathtrus. XLVII. LEGUMINOSiE. Mf 



♦ ♦ Corolla not papilionaceous. 



\ Unarmed and frlubrous DarlingtonUi. 40 



( Corolla regular. ( Armed with uncinate spines Schrmikia. 39 



Herbs. (Corolla irregular Cassia, SS 



Shrubs. Corolla ret'ular Mimosa. 38 



( unarmed. GymnocladUl. 3fl 



Trees J armed with triple spines Gleditschia. 31 



Suborder 1. PAPIIjIONACEJB. 



Petals papilionaceous, imbricate in aestivation, the upper one exter- 

 nal. Stamens mostly 10 and diadelphous. 



1. LATHlfRUS. 

 Calyx campanulate, the 2 upper sepals shortest ; stamens 10, dia- 

 delphous (9 and 1) ; style flat, dilated above, ascending, bent at a 

 right angle with the ovary, pubescent or villous along the inside next 

 the free stamen ; legume oblong, several-seeded. — Herbaceous, mostly 

 climbing. Jbvs abruptly pinnate, of 1 — several pairs ofleajiets. Petioles 

 prodwced into tendrils. Peds. axillary. 



1. L. vENosus. Muhl. 



St. 4-cornered, naked ; dips, semi-sagittate, lanceolate, very small ; ped. 

 8 — 16-flowered, shorter than the leaves; Ifts. 5 — 7 pairs, somewhat alternate, 

 obtusish, mucronate. — % In shady grounds. Can. and U. S. Stem erect, 2 — 3f 

 high, mostly smooth. Leaflets 1§ — 2' long. Pedmicles axillary, many-flow- 

 ered, aboutthe length of the leaves. Corolla purple. Legumes flat and nar- 

 roAv. Jn. Jl. 



2. L. ocHROLKUcus. Hook. (L. glaucifolius. Beck.) 



St. slender; pcd. 7 — 10-flowered, shorter than the leaves; upper segments 

 of the calyx truncate, angular ; Ifls. about 3 pairs, broadly ovate ; stip. semi-cor- 

 date. — % A small, delicate species, very rare, in shady places and on river banks, 

 N. J. to Wise. ! N. to the Aictic circle. Stem 2 — 3f long, leaning or climbing 

 on other plants. Leaflets 1 — li' long, | as wide, larger than the stipules. Pe- 

 duncles axillary, shorter than the leaves. Corolla yellowish-white (ochroleu- 

 cous.) Jn. Jl. 



3. L. PALUSTRis. Marsh Lathyrus. 



St. winged ; stip. semi-sagittate, large, ovate, mucronate ; Ifis. in 2 pairs, 

 oblong-ovate, mucronate ; ped. 3— 5-flowered, larger than the leaves. — % A slen- 

 der climber, found in wet meadows and thickets, N. Eng. to Or. Stem slender, 

 square, broadly winged at the angles, supported by the tendrils. Leaves pin- 

 Date-cirrhose, leaflets broad or narrow-ovate. Flowers drooping, rather large, 

 variegated with blue and purple. Jn. Jl. 



4. L. MARiTiMus. Bw. (Pisum maritimum. Ph.) Beach Pea. 



St. quadrangular, compressed; petioles flat above; stip. sagittate; Ifts. 

 numerous, subalternate, ovate ; pcd. many-flowered. — A pale green, creeping 

 plant, resembling the common pea, foimd on sandy shores, N. Y. to Lab., W. 

 to Or. Stem rigid, 1 — 2f in length. Stipules connate. Leaves ending in a 

 branching tendril, the lower pairs of leaflets largest. Flowers large, blue. Pod 

 hairy. May — July. 



5. L. MYRTIFOLIUS. Muhl. 



St. quadrangular, winged, weak andflexuous; stip. semi-sagittate, ovate- 

 lanceolate, acuminate ; Ifts. 2 pairs, oblong-lanceolate, acute, mucronate, vein- 

 less ; ped. longer than the leaves, 4 — 5-flowered.— t; A little climber, on river 

 banks. Can. to Md. Rnbbins. Stem about 3f long. Leaflets 1—2' long, i as 

 wide. Flowers pale purple. Jl. Aug. 



6. L. LATiFOLius. Everlasting Pea.— Pcd. many-flowered ; Ifls. 2, lanceolate ; 

 joints membranous, winged.— 1j. A very showy plant lor gardens and arbors, 

 native of England. Stein Gf long, climbing, winged between the joints. Flow- 

 ers large, pink, clustered on a peduncle 6 — 10' in length. Jl. Aug. 



7. L. ODOR ATI'S. Sweet Pea.— Pcd. 2-flowcred; tfts. 2, ovate-oblong; leg. 



19* 



