Lathyrus. | XXV. PAPILIONACE. 125 
Leafstalks without real leaflets. 
Stipules large and leaf-like. Leafstalk a mere tendril. 
Flowers yellow 2. L. Aphaca. 
Stipules none. Leafstalk flattened, resembling a grass: -leaf, 
Flowers pale red . Ae ; » 1, ZL. Nissolia, 
Leaves with one pair of leaflets. 
Annual, with small red flowers. Podshairy . ; i . & L. hirsutus, 
Perennial, with large red or purplish flowers. Pods glabrous. 
Rootstock tuberous. Stems not winged : P ; . 5. L, tuberosus. 
Rootstock without tubers. Stems winged . ° - . 6. L. sylvestris. 
Perennial, with yellow flowers. Pods glabrous ; E . 4. DL. pratensis. 
Leaves with two or more pairs of leaflets, 
Stipules deeply divided . ; F ° ; ‘ ; . Vicia bithynica, 
Stipules entire. 
Leafstalk ending in a simple or branched tendril. 
Leaflets lanceolate. Stipules narrow, half-sagittate . . 7. DL. palustris, 
Leaflets ovate or elliptical. Stipules eee broadly ena 
Sagittate . d . 8 ZL maritinus. 
Leaflets ending in a short fine point. 
Leaflets 2 or 3 pairs, rarely 4 pairs, lanceolate or linear . 9. DZ. macrorrhizus. 
Leaflets 5 or 6 pairs, rarely 4 pairs, ovate . . : ~ 10. DL. niger. 
The Sicilian sweet Pea, the Tangiers Pea, the South American Anson’s 
Pea, and some other exotic species of Lathyrus, are cultivated in our flower- 
gardens. The Pea of our kitchen-gardens and fields is usually distin- 
guished as a genus, under the name of Pisum, but upon characters which 
are hardly sufficient for the separation of a solitary species. 
1. G. Nissolia, Linn. (fig. 287). Grass Pea, Vetchling, Grass Vetch. 
—An erect, glabrous annual, branching from the base, about a foot high. 
Leaves all reduced to a long, linear, grass-like, flattened leaf-stalk, ending 
in a fine point, without leaflets or stipules. Peduncles long, bearing imme- 
diately below their summit 1 or rarely 2 small pale red flowers. Pod long, 
narrow, and straight. 
In bushy places, grassy borders of fields, and stony pastures, in central 
and southern Europe to the Caucasus, but not extending into northern 
Germany. In Britain, spread over central and southern England, but rare 
and not known in Ireland or Scotland, Fl. early summer. 
2. &. Aphaca, Linn. (fig. 288). Yellow Pea, Yellow Vetchling.—-A 
weak, branching, glabrous annual, about a foot long, without real leaflets, 
but , the two large, broadly heart- shaped or sagittate stipules assume the 
appearance of simple opposite leaves, with a slender branching tendril 
between them. Peduncles long and slender, with 1 or rarely 2 small 
yellow flowers. Pod rather more than an inch long, flattened, glabrous, 
containing 4 to 8 seeds. 
In waste and cultivated places, in central and southern Europe and cen- 
tral Asia, spreading northwards as a cornfield weed, and, as such, appearing 
occasionally in the midland and southern counties of England, Fl. early 
summer. 
3. L. hirsutus, Linn. (fig. 289). Rough Pea.—A weak annual, much 
branched at the base, a foot leng or more, with the young shoots slightly 
hairy. Stipules narrow. Tendrils branched, with a single pair of linear- 
lanceolate leaflets. Peduncles long, with 1 or 2 rather small flowers. 
Standard bright red, the keel and wings paler. Pod hairy. 
In cultivated and waste places, in southern Europe to the Caucasus, 
spreading northwards as a cornfield weed, and as such has been found, but 
