114 Systematik und Pflanzengeographie. 



White, T. Gr., A preliminary revision of the genus 

 Lathyrus in North and Central America. (Bulletin of the 

 Torrey Botanical Club. Vol. XXI. 1894. No. 10. p. 444 



— 458.) 



Im genannten Gebiete erkennt Verf. 33 Arten der Gattung. 

 Die Abhandlung giebt Synonymie und für neue oder bisher un- 

 genau bekannte Arten ausführliche Diagnosen. 



Neu sind : 



L. myriifolius MuhL, var. macranthus n. var., L. maritiutus L., var. Aleuti- 

 cus Greene, ined., L. violaceue Greene, var. Barberae n. var., L. coriaceus n. 

 sp. (= L. palustris S. Wats. [1871] non L.), L. longipes n. sp. (= L. vanosus 

 Hemsley non Muhl.), L. obovatus (Torr.) var. stipulaceus n. var., L. Oregonensis 

 n. sp., aus Oregon und Washington, L. bijugatus n. sp., aus Idaho und Was- 

 hington, mit var. Sandbergi n. var. 



Neue Namen sind : 



L. Watsoni White (= L. Californicus S. Wats. non Dougl.), L. Alsfeldi 

 White (= Orobus Californicus Alef., non L. Californicus Dougl.), L. gramini- 

 folius (S. Wats.,) White (== L. palustris var. graminifolius 8. Wats.), L. obovatus 

 (Torr.) White (= L. venosus var. obovatus Torr., = L. Newadensis S. Wats.), 

 L. rigidus White (= L. albus S. Wats. non Kittel,). L. Mexicanus Schlecht, 

 ist wahrscheinlich L. tingitans L., Verf. hat aber den Typus nicht gesehen. L. 

 cinctus S. Wats. ist Vicia gigantea Hook. 



Verf. giebt folgenden Schlüssel zur Bestimmuug der Arten : 



Leaflets a Single pair. 



Ännual; racemes 1 — 2 flowered; 



flowers purple. 1. L. pusillus Ell. 



Perennial; racemes 4 — 10 flowered; 



flowers yellow. 2. L. pratensis L. 



Leaflets 2-several pairs. 

 Sterns winged. 



Leaflets 3 pairs, glabrous or pubescent ; racemes 2 — 6 flowered. 



3. L. palustris L. 

 Leaflets 4 — 6 paired ; pubescent; racemes 6 — 15 flowered. 



4. L. Watsoni Whitt. 

 Leaflets 4 — G paired; glabrous, coriaceous; racemes 6 — 15 flowered. 



5. L. Japsoni Greene. 

 Sterns wiügless. 



Plants glabrous, puberulent or pubescent, not villous. 

 Climbing by simple or 3-forked tendrils. 



Stipules large, mostly half as large as adjacent leaflets. 

 Leaflets 2 — 5 (mostly 3) pairs. 



Flowers creame-colored. 6. L. ochroleucus Hook. 



Flowers pursale. 



Racemes 2 — 6-flowered. 



Leaflets membranaceous. 



Flowers iess than 1 — 5 cm long. 



7. L. myrtifolius Muhl. 



Flowers at least 2 cm long. 8. L. pauciflora Fernald. 



Leaflets coriaceous. 19. L. parvifolius S. Wats. 



Bacemes many-flowered. 9. L. Bolanderi 8. Wats. 



Leaflets 5 — 7 pairs. 



Flowers yellow. 10. L. sulphureus Brewer. 



Flowers purple. 



Baceme exceeding the rachis of its leaf. 



11. L. Älefeldi White. 

 Baceme not exceeding the rachis of its leaf. 

 Glabrous, flaccid, leaflets 5 — 8 pairs. 



12. L. polyphyllus Nutt. 



