CACTACEAE. 239 



Filament red ; fruit very prickly. 6. O. rhodantha. 



Filaments yellow; fruit scarcely prickly. 7. O. xanthostemma. 



Internodes oblong or nearly cylindrical, turgid and nearly terete, easily break- 

 ing off, 2-4 cm. long. 8. O. fragilis. 

 Internodes of stem elongated, cylindric or prismatic. 



Tubercles of the stem sharp and comb-like ; erect shrub. 9. O. arborcscens. 



Tubercles neither prominent nor comb-like ; plant decumbent. 



10. O. Davisii. 



1. Opuntia mesacantha Raf. (O. RaHncsqiii Engelm.) On plains and 

 prairies especially in sandy soil from Wise, and Alinn. to Ky. and Ariz. — Alt. 

 4000-5500 ft. — Fort Collins ; Denver ; Boulder. 



2. Opuntia camanchica Engelm. On plains from Colo, to Tex. and Ariz. — 

 Alt. up to 6000 ft. — Colorado Springs. 



3. Opuntia Schweriniana K. Sch. In dry places in Colo. — Sapinero. 



4. Opuntia tortispina Engelm. On plains from Neb. and Colo, to Ind. Terr. 

 — Exact locality not given. 



5. Opuntia polyacantha Haw. (O. missouriensis DC.) On plains and 

 hills from N. D. and B. C. to Ind. Terr., N. M. and Ore. — Alt. 4000-7000 ft. — 

 Quimby; Ft. Collins; Denver; Walsenburg; North Cheyenne Caiion. 



6. Opuntia rhodantha K. Sch. On plains of Neb. and Colo. — Alt. 4000-8000 

 ft. — " Colorado " ; Grand Junction ; Boulder. 



7. Opuntia xanthostemma K. Sch. On plains of western Colo. — Mesa 

 Grande. 



8. Opuntia fragilis Haw. On prairies and plains from Wise, and B. C. 

 to Kans. and Colo. — Denver; Boulder. 



9. Opuntia arborescens Engelm. On plains and hills from Colo, to Tex. 

 and Ariz. — Alt. 4000-6000 ft. — Pueblo; Piedra. 



10. Opuntia Davisii Engelm. In dry soil from Colo, to Tex. and Calif. — 

 La Plata Valley, Mancos and McElmo (Brandegee). 



Order 36. THYMELIALES. 



Family 94. ELAEAGNACEAE Lindl. Oleaster Family. 



1. LEPARGYRAEA Raf. Buff.\lo-berry. 



Leaves ovate or oval, green above; shrub thornless. i. L. canadensis. 



Leaves oblong, silvery on both sides ; shrub thorny. 2. L. argent ea. 



1. Lepargyraea canadensis (L.) Greene. {Shepherdia canadensis L.) In 

 woods from Newf. and Alaska to N. Y., Colo, and Ore. — Alt. 6500-12,000 ft. 

 — Villa Grove, Black Caiion ; Georgetown ; Bear Creek Divide, West La 

 Plata Mountains; southeast of Ouray; Box Caiion, west of Ouray; Cham- 

 bers' Lake ; Graham's Park ; mountains of Larimer Co. ; Stove Prairie Hill ; 

 Bosworth's ranch ; Eldora to Baltimore. 



2. Lepargyraea argentea (Nutt.) Greene. {Shepherdia argentea Nutt.) 

 On sandy river hanks and islands from Man., Sask. and Alb. to Kans., N. M. 

 and Nev. — Alt. 4000-7000 ft. — Grand Junction ; Cimarron ; Mancos ; La 

 Porte, Larimer Co. ; Wolcott ; Hotchkiss ; Dolores ; Durango. 



