LATHYRUS. XLV1I. LEGUMINOS^E. 219 



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Corolla not papilionaceous. 



$ Unarmed and glabrous Darlingtonia. 40 



< Corolla regular. { Armed with uncinate spines Schratikia. 39 



Herbs. \ Corolla irregular Cassia, 



Shrubs. Corolla regular Miitwsa. 38 



(unarmed Gymnocladus. 3f 



Trees {armed with triple spines Gleditacfiia. 3" 



SUBORDER 1. PAPILIONACEJE. 



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

 nal. Stamens mostly 10 and diadelphous. 



1. LATHtRUS. 



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 abruptly pinnate, of 1 several pairs of leaflets. Petioles 

 produced into tendrils. Peds. axillary. 



1. L. VENOSUS. Muhl. 



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

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

 obtusish, mucronate. Tj. 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 10-flowered, shorter than the leaves ; upper segments 

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

 date. 7J. 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 !' 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 ; slip, semi-sagittate, large, ovate, mucronate ; Ifts. in 2 pairs, 

 oblong-ovate, mucronate ; ped. 3 5-flowered, larger than the leaves. Tj. 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. PA.) Beach Pea. 



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

 numerous, subalternate, ovate ; ped. many-flowered. A pale gre^n, 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 July. 



5. L. MYRTIPOLIUS. Muhl. 



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

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

 less ; ped. longer than the leaves, 4- 5-flowered. 7J. A little climber, on river 

 banks, Can. to Md. bobbins. Stem about 3f long. Leaflets 12' long, i as 

 wide. Flowers pale purple. Jl. Aug. 



6. L. LATIFOLIDS. Everlasting Pea. Ped. many-flowered ; Ifls. 2, lanceolate ; 

 joints membranous, winged. 7J. 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. Sweet Pea. Ped 2-flowered; Ifts. 2, ovate-oblong; leg. 



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