62 THE AMERICAN BOTANIST 



nun. long, erect, in the axils of the forks or racemosely ai 

 ranged on the ultimate branches; involucre turbintae or ob- 

 ocnic, 1-1.25 mm. long, about 0.75 mm. broad, glabrous, the 

 lobes ovate, acute; periant yellow, 2.5-3 mm. long, densely 

 white-pilose without, the lobes lanceolate, acute ; fruit un- 

 known. 



This is a member of the section Pedunculata and most 

 closely related to Briogonum Ordii S. Wats. It agrees with 

 the description of that species except in the following points : 

 The perianth is yellow not white with pink tips, the hairs of 

 the perianth are longer, and the leaf-blades are not tapering 

 at the base. 



Type collected at Cameron, in the driest part of the desert 

 near Tuba, Arizona, July 15-31, 1920, W. N. Clutc yia (Herb. 

 N. Y. Bot. Garden). 



FoRESTiERA ARizoNiCA (A.Gray) Rydberg. 



Forestiera nomexicana arizonica A. Gray. Syn. Fl. 21 :76. 

 1878. 



This is a more stunted and thick-branched shrub than F. 

 neomexicana. The branches, leaves, and even the fruit is 

 densely soft-pubescent when young. The leaves are broader, 

 obovate rather than oblanceolate and short-petioled ; in age 

 they become glabrate; they are entire or crenulate and thicker 

 than in F. neomexicana. The fruit is comparatively shorter 

 and thicker, about 6 mm. long and 4.5 mm. thick, in age glab- 

 rous and black. The pubescence of the twigs is more perma- 

 nent, remaining throughout the first season. In the herbar- 

 ium ofthe New York Botanical Garden, there are the follow- 

 ing specimens : 



Arizona: Prescott, 1876. B. Palmer 580 (duplicate of 

 type, in flower) ; Desert near Tuba, July 15-31. 1920. VV. N. 

 Clutc 118 (fruit). 



