7] a 
desert west of the Colorado. A shrub 3—4 feet high, with numer- 
ous slender branches; its appearance being that of ‘Scotch broom, 
(Spartium scoparium.) The sheaths are very long, 3-parted, with 
“subulate-acuminate segments. This can hardly be the E£. America- 
na of Quito, which is described as having 2-parted sheaths. The 
specimens are without either flowers or fruit. If the species should 
prove to be new, it may be called E. trifurcus. There seems to be 
_ still another species growing on the table lands of New Mexico, 
_ differing from the preceding in its very short sheaths. 
Juniperus. Two undetermined species were found in crossing 
the country from the Del Norte to the Gila. Both of them have 
the generai character of J. Virginiana. One is a large tree, with 
acerose leaves, and a bark like that ofa Pinus; the other has short 
closely appressed leaves, and berries larger than a buck shot. 
AMARYLLIDACEX. 
- e Americans, Linn. Found i in descending the western slope 
of nike Cordilleras of California. is is the maguey of the Mexi- 
cans. It shoots up a flowering stal < 10 or 15 feet high. The juice 
of the plant affords an intoxicating drink called pulque. 
Another species of Agave, or a very remarkable variety of the 
preceding was found in New Mexico, west of the Del Norte. It. 
differs from A. Americana in its much shorter and broader leaves, 
which are furnished with smaller marginal spines. 
LILIACE. 
Yucca. ‘The leaves only, of what appear to be four species of 
Sav a pens. occur in the collection, but we cannot identify 55 3: for 
ant of the inflorescence. 
“ ORCHIDACE. 
x inne cernua, Rich. Low grounds in the valley of the Del < 
CYPERACE. 
ae ae Saditirnintes R. Brown. Valley of the Gila. 
Cyperu s Michauxianus, Schultes. Valiey of the Gila. | 
GRAMINE. 
“Choris ‘tha, resl. Spikes umbellate-fasciculate, humerous, : 
13,) the ped 
ncle enclosed in a broad coin presueenenaa F 
s 2-flowered; upper glume nearly as long as the flo 
d, with a short awn between the teeth; lower palea o! of th Pe 
flower obscurely 5 towel Taine in the middle, the mar- 
ciliate with long hairs towar summit; awn gi times as 
as the palea; neuter flower broa trounce a 
t aristiform rudiment; the awn twi Bed | 
Gila. Very near OC: °ba ‘bata 
