Bulletin University of New Mexico—No. 49 
lobed or dissected leaves; inconspicuous greenish flow- 
ers, fertile heads 1-3 together and sessile in the axil of 
leaves or bracts at the base of racemes or spikes of 
sterile heads, 1-flower in each head consisting of pistil 
only. 
Leaves opposite, large, palmately cleft 
only, - A. APTERA. 
Many leaves alternate, all once or twice 
pinnatifid, - - A, ARTEMESIAEFOLIA. 
A, apTERA, D. C. Western Giant Ragweed. Stem 
stout, 3-10 feet high, rough hairy, leaves large, com- 
monly 5-lobed, the middle lobe often 3-cleft; fruit 4-8 
ribbed and with 4-6 short or obsolete tubercles. Along 
acequias, along stream bank in Tijeras Canon. 
A, ARTEMISIAEFOLIA, L. Rag-weed, Hog-weed. Much 
branched, 1 to 3 feet high, hairy or roughish-pubescent ; 
leaves thin, twice pinatifid, smoothish above, paler or 
hoary beneath; fruit obovoid or globular, armed with 
about 6 short acute teeth or spines. A very common 
weed in fields in the East but rare here. 
20. FRANSERIA, Cav. Spiny Rag-weed. 
Ours an herb and low, leaves alternate. Head 1- 
flowered in ours. 
F. HOOKERIANA, Nutt. Duffusely spreading, freely 
branching, hirsute; leaves ovate or roundish, bipinnate 
or upper oblonb and pinnatifid; fruit 1-4 to 1-3 in. 
long armed with flat, thin, long, and straight spies. In 
sandy arroyo north of Menaul School. 
21. xantuium, Tourn, Cockelbur Clotbur. 
Coarse grayish weeds, with low, branching, stout 
stems; alternate toothed or lobed leaves, petiolate; fer- 
tile involucre closed, hard, covered with hooked bristles 
so as to form a bur, rough and about 1 in. long (in 
ours) 2-celled and 2-flowered. 
x2. CANADENSE, Mill. Leaves cordate or ovate, 3- 
nerved, stem often with brown dots. Very common in 
low ground along the river and acequias. Burs trouble- 
some to animals, 
92. zinnta, LD. 
Herbaceous or slightly shrubby plants, with opposite 
and mostly sessile, entire leaves, single and showy 
heads terminating the branches, disk flowers perfect 
and fertile, involeuere of closely appressed and im- 
bricated, dry, firm, broad, bracts; chaff of the conical 
or cylindraceous receptacle folded around the disk 
(15) 
