FAB ACE AE. 217 



8. Vicia producta Rydb. On gravelly hills and sides of cafions from Colo, 

 and Utah to N. M. and Ariz. — Alt. 7000-8000 ft. — Butte five miles southwest 

 of La Veta; Brantly Caiion, Las Animas Co.; Spring Canon. 



34. LATHYRUS L. Velchling, Marsh Pea. 



Flowers less than 18 mm. long; corolla white. 



Leaflets oval to oblong. i. L. leucanthus. 



Leaflets linear. 2. L. arieonicus. 



Flowers about 2 cm. or more. 



Corolla purple. 



Stipules large and broad, about half as long as the leaflets. 



3. L. utahensis. 

 Stipules narrow, less 'than half as long as the leaflets. 



Leaflets elliptic to oval ; upper leaves at least with well deveoped tendrils. 



4. L. decapetalus. 

 Leaflets linear or nearly so ; tendrils reduced to cusps or small appendages. 



Plant glabrous or nearly so. S. L. ornatus. 



Plant decidedly villous-pubescent. 6. L. incanus. 



Corolla white or yellowish. 7. L. laetivirens. 



1. Lathyrus leucanthus Rydb. Hillsides, among bushes and open woods, 

 in Colo, and N. M. — Alt. 8000-11,000 ft. — Empire; Veta Pass; Ojo; above 

 Mancos ; Boulder ; Tennessee Pass, Lake Co. ; Pass Creek ; mountain near 

 Veta Pass; Rico, Dolores Co.; West Indian Creek; Los Pinos (Bayfield); 

 North Park, near Teller; Van Boxle's ranch, above Cimarron; Victoria; 

 Leroux Creek; Michigan Fork; Spicer. 



2. Lathyrus arizonicus Britton. On wooded hillsides from Colo, to Ariz. — 

 Alt. 8000-11,000 ft. — West Mancos Caiion; Mt. Hesperus; Grayback mining 

 camps and Placer Gulch; Pass Creek; Iron Mountain; West Indian Creek. 



3. Lathyrus utahensis Jones. In valleys of Utah and Colo. — Parrott; 

 Durango. 



4. Lathyrus decapetalus Pursh. On plains and table-lands from Colo, and 

 Utah to N. M. and Ariz. — Alt. 7000-8000 ft. — Cato; Cucharas River, below 

 La Veta; Calhan; Mancos; Palmer Lake; Robinson; Mancos Canon; Swal- 

 lows, between Pueblo and Cafion City; Gunnison; Sapinero. 



5. Lathyrus ornatus Nutt. On prairies and plains, S. D. and Wyo. to Ind. 

 Terr, and Colo. — Alt. 4000-8000 ft. — Mesas near Colorado Springs; Dillon 

 Caiion; along Conejos River, north of Antonito; Dolores; Colorado City. 



6. Lathyrus incanus (Rydb. & Smith) Rydb. (L. ornatus incanus Rydb. 

 & Smith.) On sandy plains from Neb. and Wyo. to Colo, and Utah. — Alt. 

 4000-8000 ft. — -Table Rock; Palmer Lake; Calhan. 



7. Lathyrus laetivirens Greene. In the mountains of Colo. — Alt. about 

 8000 ft. — Cerro Summit; Steamboat Springs. 



Order 28. GERANIALES. 



Plants destitute of secreting glands or cells in the tissue. 



Styles united around a central column from which they break at maturity. 



Fam. 72. Geraniaceae. 

 Styles distinct or permanently united. 



Styles distinct or partly united ; the tips and the stigmas free. 



Leaves simple ; stamens 5. 73. Linaceae. 



Leaves compound; stamens 10-15. 74. Oxalidaceae. 



Styles and stigmas permanently united. 75. Zygophyllaceae 



Plants with secreting glands often in the leaves or only in the bark. 



76. Rutaceae. 



