53 



inch long. Panicle long exserted, ^ of an inch long, the numerous 

 erect or but slightly spreading branches single or in pairs, simple or 

 branched, varying in number and length, smooth below. Rachis of 

 the spikes jointed, each joint i^ lines long, flattened, densely bearded 

 on the edges, hairs at the base of each spikelet a little shorter than 

 or (usually) exceeding it by a line or so. Pedicel of the neutral 

 floret flattened and bearded like the joints of the rachis, 1-2 lines 

 long. Outer glume oblong-lanceolate, flattened on the back, i^ to a 

 little over 2 lines long, 7-9-nerved, more or less silky villous below, 

 smooth above, strongly scabrous near the tip and on the upper por- 

 tion of the angle made by the infolding of the narrow margin; second 

 glume a little shorter and more pointed than the first, 3-nerved, 

 ciliate on the inturned margin, very smooth on the back ; third 

 glume neutral and without a palea, very thin and transparent, oblong, 

 obtuse, i"i:|- lines long; fousth glume without a palea, fertile 

 scarcely wider than the long (5-6 lines) twisted and more or less 

 geniculate scabrous awn into which it passes. Rudimentary floret 

 of a single empty lanceolate glume 1^-2 lines long; a second glume 

 and sometimes also an imperfect awn is present. 



Dr. Torrey, in his description, says : '^ Nodes smooth, leaves very 

 smooth on both sides, stipule obsolete, palets two, shorter than the 

 glumes, the lower terminating in a slightly contorted awn. The 

 other portions of Dr. Torrey's description agree with that given 

 above. He mistook the nature and relative position of the "palets," 

 or as he had it, ''corolla,'' which he said was "two-valved." There 

 are two valves within the two outer glumes, but they are the lower 

 palets of two flowers, the lower one being neutral, and both destitute 

 of upper pales; and it is the upper one which is awned. 



F. Lamson Scribner. 



Notes on the Trees of the South-west — The San Francisco 



Mountains here mentioned are in the extreme eastern part of Arizona, 

 just north of the Gila and west of the San Francisco River. The Burro 

 and the Bear Mountains extend in a north-westerly direction, from 

 points a little to the west of Silver City, to the Gila River, being sep- 

 arated from one another by the Mangus basin. The Bear Mountains 

 are the northern ones. The MogoUon Mountains are situated in the 

 extreme western part of New Mexico, between the Gila and San 

 Francisco Rivers, a little north-east of the San Francisco Mountains. 



The onl^ wooded sections are in the mountains^ and the hills 

 near them, and along the streams. 



Fouqtiiera splendens, Engelm. — This plant, although a shrub, is 

 introduced here on account of the general use to which the wood is 

 put by the Mexicans. It is very peculiar^ and, in flower, it is hand- 

 some. It is commonly known as " coach-whip cactus," or simply 

 '* coach-whip," It is very largely used by the Mexicans in South- 

 western Arizona for fencing, the poles being set up contiguously in 

 trenches, and bound by a row placed horizontally near the top. The 

 thorns render such a fence impassable. The plants are also occa- 

 sionally used for roofing-poles* 



Prunus CapoUin, Zucc, is, with the exception of the mahogany, 



