Lathyrus. XLVII. LEGUMINO- .L. ^1-; 

 * * Corolla not papilionaceous. 



,„ „ , J Unarmed and glabrous T)a.rlin''1rmt/t in 



< Corolla regular. Uimed with uncinate spines. uarim^ionui. Vs 



Herbs. ( Corolla irregular. 

 Shrubs. Corolla regular. 



i unarmed. 

 Trees ( armed with triple spines. 



Schranlcia. 39 

 Cassia, 35 



Tdimosa. 38 



Gymnocladus. it 

 Gleditscliia. 31 



Suborder 1. PAPILIONACEJE. 



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

 nal. Stamens mostly 10 and diadelphous. 

 1. LATHl^RUS. 

 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. _ Lvs ahrwptly f innate., of I — several pairs of leaflets. Feiioles 

 froduced into tendrils. Feds, axillary. 



J^l. L. vENosus. Muhl. 



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

 8— IG-flowered, shorter than the leaves; Ifts. 5—1 pairs, somewhat alternate, 

 obtusish, mucronate.— 11. In shady ground's, Can. and U. S. Stem erect, 3— 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; pcd. 7 — 10-flowered, shorter than the leaves; vj/per segments 

 of the calyx truncate, angular ; Ifts. about 3 pairs, broadly ovate ; slip, 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 — IJ' long, | as v/ide, 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 ; stlp. semi-sagittate, large, ovate, mucronate ; Ifts. in 2 pairs, 

 oblong-ovate, mucronate ; jxd. 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, com.pressed ; petioles flat above ; stip. sagittate ; tfts. 

 numerous, subalternate, ovate ; j)ed. 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 coimate. 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; s?/^. semi-sagittate, ovate- 

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

 less ; ped. longer than the leaves, 4 — 5-flowered. — '2J. A little climber, on river 

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

 wide. Flowers pale purple. Jl. Aug. 



6. L. LATjFOLiu.s. Everlasting Pea. — Ped. many-flowered ; Ifls. 2, lanceolate ; 

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

 native of England. Stem 6f long, climbing, winged between the joints. Flow- 

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



7. L. ODORATUs. Sv^eet Pea.— Pcd. 2-flowered; Ifts. 2, ovate-oblong; leg, 



19* 



