Lathyrus. XLVll. LEGUMlNOSiE. 219 



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Corolla not papilionaceous. 



,„ „ , S tnarmed and glabrous DarUngtmia. 40 



i Corolla regular. ( Armed with uncinate spines Schranfda. 39 



Herbs. ( Corolla irregular Cassia, 35 



Shrubs. Corolla regular Mimosa. 38 



Sunarrned. .-, •. Gymnocladua. 38 



Trees { armed with tnple spines Gleditschia. 31 



Suborder 1. PAPIIilOXACE^. 



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

 nal. Stamens mostly 10 and diadelphous. 

 1. lathYrus. 

 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^ Tnostly 

 climbing. Lvs abruptly pi7i7iaie, of 1 — several pairs ofleajlets. Petioles 

 produced into tendrils. Peds. axillary. 



1. L. vENosus. Muhl. 



St. 4-cornered, naked ; stips. 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 U— 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. Hoolv. (L. glaucifolius. Beck.) 



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

 of the calyx truncate, angular ; Ifts, 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 Arctic circle. Stem 2 — 3f long, leaning or climbing 

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

 duncles axillar}-', shorter than "the leaves. Corolla yellowish-white (ochroleu- 

 cous.) Jn. Jl. 



3. L. PALUSTRis. Marsh Lathyrus. 



St. winged ; 5^/;;. semi-sagittate, large, ovate, mucronate ; Ifts. 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- 

 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 ; pcd. 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 irt 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 ; pcd. longer than the leaves, i — 5-flowered. — % A little climber, on river 

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

 wide. Flowers pale purple. Jl. Aug. 



C. L. LATiFoi.ius. Evcrl^stinq Pea. — Pf^/. many-flowered ;//?.'?. 2, lanceolate ; 

 juiiits membranous, winged. — % A very showy plant for gardens and arboi-s, 

 native of England. Stem Gi' long, climbing, winged lieiwcen the joint.s Flow- 

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



7. L. ODORATU8. Sirrct Par. — Pcd. 2-flowered; //?.^. 2, ovate-oblong; l*'g. 

 19* 



