Lathyuus. XLVII. LlOGUMINOSiE. 219 



*♦ Corolla not papilionaceous, 



\ Unnrmed niul Klabrous Darlingtonia. 40 



J Corolla regular. (Armed with unciiiulc si>inc8 tichranlaa. 39 



Herbs. (Corolla irregular Cwisia, 35 



Shrubs. Corolla regular Mimosa. 38 



\ unarmed (iijmnocladut. 3fi 



Trees (armed with triple spines (JltdUschia. 37 



Suborder 1. P A P I li I O N A C E iE. 



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

 nal. Stamens mostly 10 and diadelplious. 



1. LATHIS R US. 

 Calyx carapanulate, 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 

 clunbirig. Lvs abmytly phmate, of 1 — several pairs of leaflets. Petioles 

 produced inio tendrils. Feds, axillary. 



1. L. vENosus. Muhl. 



St. 4-cornered, naked ; $Hps. semi-sagittate, lanceolate, very small ; j^^d. 

 8 — lG-flo\vered, shorter than the leaves; Ifls. 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. Peduncles axillary, many-flow- 

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

 row, Jn, Jl, 



2. L. ocHROLEUcus, Hook, (L, glaucifolius. Beck.') 



St. slender; ped. 7 — lO-flowered, shorter than the leaves; upper segments 

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

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

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

 on other plants. Leaflets 1 — H' long, f 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 ; Ifts. in 2 pairs, 

 oblong-ovate, mucronate ; ped. 3— 5-flowered, larger than the leaves.— 7J. 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- 

 nate-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; ped. many-flowered. — A pale green, creeping 

 plant, resembling the common pea, found 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 — Jul)'. 



5. L. MYRTIFOLICS. Muhl. 



St. quadrangular, winged, weak andflexuous; 5<7>, semi-sagittate, ovate- 

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

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

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

 wide. Flowers pale purple. Jl. Aug. 



G, L, LATiPOLius. Everlasting Pea. — Ped. many-flowered ; Ifls. 2, lanceolate ; 

 joints membranous, winged. — % A very showv plant for gardens and arbors, 

 nalive of England. Stem G( long, climbing, winged between the joints. Flow- 

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



7. L. oDORATUs. Sweet Pea.— Ped 2-flowered; Ifts. 2, ovate-oblong; leg. 



