OF ARTS AND SCIENCES. 121 



Var. ANGUSTIFOLIA. Leaves linear, often more or less revolute. 



Obione occidenfalis, var. anrjustifoUa. Torrey, Bot. Mex. Bound. 184. 

 Collectors : — Gregg ; Edwards ; 576, 1742 Wright. 



13. EUROTIA, Adanson. 



Flowers dioecious or monoecious. Male flowers bractless, the calyx 

 4-23arted with unappendaged lobes and as many stamens ; filaments 

 slender, exserted. Pistillate flowers without calyx, bibracteate. Bracts 

 sessile, somewhat obcompressed, united to the apex, becoming enlarged 

 and rather rigidly membranous, not winged, 2-horned at the apex, the 

 sides densely covered with long S2:)reading tufted hairs. Ovary oblong- 

 ovate, sessile, hairy, firmly membranous : styles 2, exserted, somewhat 

 hairy. Seed vertical, obovate, the testa simple : cotyledons broad and 

 green ; radicle inferior. — Low pubescent undershrubs, with alternate 

 entire leaves, and small clustered axillary and subspicate flowers. 



1. E. LAN AT A, Moquin. White-tomentose throughout with stellate 

 hairs (becoming rufous), |— 1^ feet high, erect, with strict ascending 

 leafy branches ; leaves linear to narrowly lanceolate, with revolute mar- 

 gins, -|-1^ inches long, obtuse; calyx-lobes ovate, acute, hairy; bracts 

 lanceolate, 2-3 lines long in fruit, with two short horns at the apex, 

 penicillate with four dense spreading tufts of silvery -white hairs ; 

 utricle filling the theca and loosely enveloping the seed, which is 1|- 

 lines long. — From the Saskatchewan to New Mexico, and westward 

 to the Sierra Nevada ; a valuable forage-plant. Quite distinct from 

 E. ceratoides of the Old World. 



Diotis lanata. Pursh, 602. Nuttall, Genera, 2. 207. James, Catalogue, 

 189. Spreng. Syst. 3. 836. 



Eurotia ceratoides. Hook. Fl. Bor.-Am. 2. 126 ; not Mey. Bourgeau, Palli- 

 ser's Rep. 260. Torr. Bot. Wilkes's Exp. 438. 



Eurotia lanata. Moquin, Enum. Chenop. 81 ; DC. Prodr. 132. 121. Torrey, 

 Fremont's Rep. S5 ; Emory's Rep. 149 and 409 ; Pac. R. R. Rep. 2. 124 

 and 4. 130 ; Bot. Mex. Bound. 184. Engelm. PI. Upp. Miss. 206. Gray, 

 Pac. R.R. Rep. 12. 47; Am. Jour. Sci. 2. 34. 258. Watson, King's Rep. 

 5. 292. Coulter, Hayden's Rep., 1872, 779. Porter, Fl. Col. 118. 



Collectors: — James; Drummond ; Nicollet; 42, 440 Fremont; 1383 Ber- 

 landier; 713, 714 Fendler; 579, 1744 Wright; Abert; Emory; 107 

 Geyer; 81 Beckwith ; H. Engelmann; 328 Parry; Bourgeau; 990 Wat- 

 son ; 366 Vasey ; 857 Kell. & Harford ; Haj'den. 



14. GRATIA, Hook. & Arn. 



Flowers dioecious or sometimes monoecious. Calyx of the bractless 

 staminate flowers mostly 4-parted, the 4-5 stamens central, with short 



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