DICOTYLEDONOUS PLANTS 129 



XX. LATHYRUS, Tourn. 



Like Vicia excepting that the leaflets are fewer and the 

 style is bearded on the side toward the standard. 



1. L. venosus, Muhl. Yeiny Vetch. Perennial. Stem stout, 

 prominently angled, climbing or reclining, 2-5 ft. long. Leaves 

 short-petioled ; stipules large, lanceolate ; leaflets 5-7 pairs, broadly 

 ovate-obtuse, mucronate. Peduncles nearly as long as the leaves, 

 inany-flowered. Flowers purple, f in. long. Calyx-teeth very 

 unequal. Pod linear, veined, 4-6-seeded. Shady banks and moist 

 prairies.* 



2. L. maritimus, Bigelow. Beach Pea. Perennial. Stem stout, 

 1-2 ft. high. Stipules broadly ovate and heart or halberd shaped, 

 nearly as large as the 6-12 leaflets, of which the lower pair is the 

 largest ; tendrils pretty large. Flowers large, blue or piu'ple. Sea- 

 shores and beaches of the Great Lakes. 



3. L. palustris, L. AYild Pea. Stem frequently winged, slender, 

 and climbing b}^ delicate tendrils at the ends of the leaves. Stipules 

 narrow and pointed ; leaflets 4-8, narrowly oblong to linear, acute. 

 Peduncles bearing 2-6 pretty large, drooping, blue, purple, and 

 white flowers. Damp thickets and borders of swamps. 



4. L. odoratus, L. Sweet Pea. Annual. Stem roughish- 

 hairy, it and the petioles winged. Leaflets only one pair, oval or ob- 

 long. Flowers large, 2 or 3 on the long peduncles, sweet-scented, 

 white, rose-color, purple, or variegated. Cultivated from Em-ope. 



XXI. PISUM, L. 



Climbing or prostrate herbs. Style enlarged above, grooved 

 on the back, soft-hairy down on the inner edge. Leaflets 

 1-3 pairs. Flowers and fruit much like those of Lathyrus. 



1. P. sativum, L. Commox Pea. Annual. Smooth and covered 

 with a bloom. Leaflets usually 2 pairs ; tendrils branching ; stip- 

 ules large, ovate, rather heart-shaped at the base. Peduncle several- 

 flowered. Flowers white, bluish, reddish, or variegated. Pods large ; 

 seeds globular or somewhat flattened and wrinkled. There are 

 many varieties, differing greatly in size, of the plant and of the 

 fruit. Cultivated from Europe (?). 



47. GERANIACE^. Geranium Family. 



Herbs or small shrubs. Leaves simple, usually with glan- 

 dular hairs which secrete an aromatic oil. Flowers perfect, 



