SYNOPSIS OF THE FLORA OF COLORADO. 127 



URTICACEAE. 



CELTIS OCCIDENTALS, L. Gray j s Manual, p. 443. Canon City, Bran- 

 degee. 



URTICA GRACILIS, Ait. Gray's Manual, p. 444. Plains of the Platte, 

 Coulter. 



URTICA DIOICA, L. Gray's Manual, p. 444. Sierra Madre Eange, at 

 10,000 feet altitude, Coulter. 



PARIETARIA PENNSYLVANIA, Muhl. Gray's Manual, p. 446. Canon 

 City, Brandegee. Median. 



HUMULUS LUPULUS, L. Gray's Manual, p. 446. Hoopes. Along the 

 Platte, Porter. In the Sierra Madre Eange, at 10,000 feet altitude, Coul- 

 ter. Webster Canon, Redjield. 



CUPULIFER.E. 



QUERCUS ALBA, L., var. GUNNISONI, Torr. Pacif. E. R. Rep. 2, p. 130. 

 Shrub 6-10 high; leaves oblong, somewhat coriaceous, with a minute, 

 yellowish, downy pubescence underneath, 3'-5' long, with 3-4 pairs of 

 rather narrow oblong subequal lobes ; lobes subentire, obtuse; fruit on 

 a long peduncle; cup hemispherical, about 5" broad and 3" deep; acorn 

 smaller than that of Q. alba, usually 9" long and 5" in diameter, some- 

 times much shorter and scarcely exceeding the cup. There is a great 

 diversity of views among botanists as to the true position of this oak. 

 Mr. Watson (Amer. Nat. 7, p. 372) regards it as one of the many varieties 

 of Q. undulata, Torr., but it seems so widely different in the shape and 

 section of its leaves and size of the fruit from the figure of that species 

 as given in Ann. X. Y. Lye. 2, pi. 4, that we prefer to retain the old 

 name for the present. At the base of the foot-hills, covering the dry 

 slopes. The most common scrub-oak. Canby ; Hall & Harbour ; Porter ; 

 Coulter. 



QUERCUS EMORYI, Torr., in Emory's Rep., p. 152, pi. 9. A low shrub; 

 leaves coriaceous, oblong, on very short petioles, l'-2' long, variable in 

 size, remotely and repandly toothed, or in the younger ones with deeper 

 and crowded teeth; teeth short, bristle-pointed; glabrous above, yel- 

 lowish-do wny beneath; fruit pedunculate, solitary and in pairs; acorn 

 ovoid or ovoid-oblong, mucronate ; the scales appressed. Canon City, 

 Brandegee. 



CORYLUS ROSTRATA, Ait. Hall tfc Harbour, 516. 



BETFI.ACE.E. 



BETULA OCCIDENTALS, Hook. Fl. Bor. Am., 2, p. 155. Watson iuKhiffn 

 Rep., vol. 5, p. 323, pi. 35. Shrub 8-12 high ; branches dark reddish- 

 brown, sprinkled with resinous warts; leaves I'-IJ' long, 9 // -15 // wide, 

 thin, broadly ovate, acute, truncate or ctmeate at base, smooth above, 

 lighter colored beneath, petioles, margins and veins somewhat hairy, 

 not punctate, irregularly toothed or serrate, serratures short and glandu- 

 larly mucrouate ; petioles slender, 3"-(j" long ; fruiting ainents cylindri- 

 cal, 9 // -12 // long; peduncles suberect, leafy, 3"-5" long; scales pubes- 

 cent, ciliate, the lateral lobes divergent, quadrangular; seeds with 

 wings twice broader than the body. Hall & Harbour, 518; Canby ; 

 Porter. Along the Platte near Denver, Coulter. 



BETULA GLANDULOSA, MX. " Subalpine," Hall & Harbour, 517. Twin 

 Lakes, Porter. Sierra Madre Range, Coulter. 



ALNUS VIRIDIS, Ait. Hall & Harbour, 519. 



ALNUS IXCANA, \Villd. Ute Pass, Porter. 



