FABACEAE. 217 



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

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

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



34. LATHYRUS L. VELCHLING, MARSH PEA. 



Flowers less than 18 mm. long; corolla white. 



Leaflets oval to oblong. i. L. Icitcanthus. 



Leaflets linear. 2. L. arizonicus. 



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. 5. L. ornatus. 



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



Corolla white or yellowish. /. 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 Canon; 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 Caiion ; Swal- 

 lows, between Pueblo and Canon 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 incanns 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. 



