LEGUMIXOSAE (PULSE FAMILY) 527 



43. LATHYRUS [Tourn.J L. Vetchling. Everlasting Pea 



Style dilated and flattish (not grooved) above, hairy along the inner side 

 (next the free stamen). Sheath of the filauients scarcely oblique at the apex. 

 Otherwise nearly as in Mcia. — Our species perennial and mostly smooth plants 

 {\ddvpos, aleguuiinous plant of Theophrastus.) 



Stipules bruatUy ovate, regularly lialberd -shaped 1. Z. maf'itimus. 



Stipules semi-cordate, seaii-sagiltate, ur with unequal sides. 

 Flowers purple or purplish to pink or white. 

 Leaflets 4-12. 



Principal leaves with 4-S leaflets ; flowers 2—8 2. Z. paluHiris. 



Principal leaves with &-12 leaflets ; flowers 10—25 (rarely as few as 6) . 3. L. venosus. 

 Leaflets 2. 



Stems and petioles winged 5. Z. httifolius. 



Stems and petioles slender and wingless , 6. Z. tuherosus. 



Flowers yellow or yellowish. 



Leaflets 4-0: flowers yellowish-white 4. L. ochroleucus. 



Leaflets 2 ; flowers bright j^ellow 7. Z. pratensis. 



1. L. maritimus (L.) Bigel. (Beach Pea.) Stout, trailing or climbing. 0.3- 

 1 m. high; stipules nearly as large as the leaflets, the lower lobe larger and 

 usually coarsely toothed ; leaflets mostly 0-10, thick, ovate-oblong, 2-6 cm. long ; 

 peduncles a little shorter than the leaves, 6-10-flowered ; floicers large (1.8-2.5 

 cm. long), purple. — Seashores from N. J. and Ore. to the Arctic Sea; also on 

 Oneida L., N. Y.. and the Great Lakes. June-Sept. (Eurasia.) 



2. L. palustris L. Slender, glabrous, the usually xringed stems 0.5-1 m. 

 high ; stipules obliquely lanceolate to ovate, sharp -pointed at both ends; leaflets 

 3-i (rarely 5) pairs, mostly' 3.5-7 cm. long, lanceolate to elliptic, rather firm ; 

 peduncles S-o()'arely S) -flowered ; floicers ijurp\e, 1.6-2.5 c??i. long. — Banks of 

 rivers and lakes. Que. to Alaska, s. to Me., Vt., w. N. Y., and the Great L. 

 region. June-Aug. (Eurasia.) Var. piloses (Cham.) Ledeb. Lower surface 

 of leaves, peduncles, calyces, etc., pubescent. (L. myrtifolius, var. macranthus 

 T. G. White.) — Nfd. and e. Que. to e. Me. (E. Asia.) 



Var. linearifblius Ser. Stems winged, 2-7 cm. high ; leaflets 2-3 (rarely 4) 

 pairs, linear to lanceolate, firm; peduncles 2-5-flowered ; floicers 1.4-1.7 cm. 

 long. — Meadows (often brackish), shores, and open woods, Nfd. to Alaska, s. to 

 li. I., w. X. Y., and Minn. 



Var. myrtifolius (Muhl.) Gray. Stems very slender, icingless, 0.3-1 m. high ; 

 stipules sometimes broader ; leaflets 2-3 pairs, elliptical, thinner, mostly 2- 

 4 cm. long; peduncles 3-9-flowered ; floicers 1-1.5 cm. long. (L. myrtifolius 

 Muhl.) — By lakes and streams, w. Que. to ]Man., s. to N. C. and Tenn. 



3. L. venosus Muhl. Stout, climbing, usually somewhat downy ; stipules 

 very small and mostly slender ; leaflets 4-6 pairs, oblong-ovate, mostly obtuse, 

 about 5 cm. long; peduncles many-flowered ; flowers 1.2-1.6 cm. long. — Shady 

 banks, N. J. and Pa. to the Sask., and southw. May-July. 



4. L. ochroleucus Hook. Stem slender, 3-9 dm. high; stipules semicordate, 

 half as large as the thin ovate leaflets ; peduncles 7-10-flowered ; flowei-s 1.5-1.8 

 cm. long, yellowish-white. — Hillsides, w. Que. to Sask., s. to N. J., Pa.. Great 

 L. region, la., S. Dak., and ^Vyo. May-.July. 



5. L. latif6lids L. (Everlasting or Perennial Pea.) Tall perennial 

 with broadly winged ste7ns ; leaves and stipules coriaceous and veiny ; petioles 

 mostly icing ed ; the 2 elliptic to lanceolate leaflets 0.5-1 dm. long; peduncles 

 stiff, many-flowered; flowers showy, pink, purple, or white. — Fnquently 

 cultivated, and escaping to roadsides and thickets, Ct. to D. C. (Introd. 

 from Eu.) 



6. L. tuber6sds L. Slender perennial ; the rootstocks bearing numerous 

 tubers ; stems glabrous ; leaves and stipules thin; petioles and tendrils filiform ; 

 the 2 oblong leaflets 2-3.5 cm. long ; peduncles filiform, 3-6-flowered ; the fra- 

 grant violet floicers about 1.5 cm. long. — Fields and meadows, locally established 

 in Vt. and Out. June-Aug. (Introd. from Eurasia.) 



7. L. PRATENSis L. Low and straggling ; the 2 bright green leaflets narrowly 



