CATALOGUE. 
165 
woodj caudcx ; leaves pctioled, opposite and alternate, roundisli or broadly 
ovate, 2—4" wide, fcw-tootlicd or nearly entire ; heads solitary at the ends of 
nearly naked branches ; involucres 3" wide, the appressed scales obovate- 
oblong ; rays 6-10, the oblong ligules much longer than the tube and shghtly 
exceeding the disk, 2-toothed at the apex; disk-flowers about 25 ; pappus 
of a single bristle a little shorter than the disk-corolla. — The l)ranches of the 
style appear to be somewhat semi-cylindric rather than flattened. Crevices 
of limestone rocks on Stansbury Island, (Capt. Stansbury.) On the same 
island, upon rocks ; 4,500-5,000 feet elevation ; June. (587.) 
IvA AXILLARIS, Pursh. Stems 6-15' high, much branched from a 
somewhat woody slender base, very leafy ; leaves small, 9-12" long, 3-6" 
wide, obovate or oblong, obtuse, narrowed at the base, minutely appressed- 
pubescent ; heads solitary in the axils of the upper leaves, nodding on short 
peduncles; involucres of few concave orbicular fbliaceous scales, either 
distinct or partially united ; fertile flowers 4-5 ; chatf of the receptacle fili- 
form-clavellate. — Saskatchewan to Oregon and California, and eastward to 
Nebraska ; about Virginia City, Nevada, (Bloomer.) Abundant in the 
Valleys, from the Truckee River to the Wahsatch ; 4-6,000 feet elevation ; 
June-Sej)tember. (588.) 
Ambrosia artemisi^folia, L. North America from the Atlantic to 
the Pacific, northward to the Saskatchewan and southward to Texas. 
Humboldt Pass, Nevada ; 6,000 feet elevation ; September. (589.) 
Ambrosia psilostachya, DC. (A. coronopifoUa, T. & G.) Illinois to 
California, and southward to Texas ; Salt Lake Valley, (Stansbury.) Jordan 
Valley ; 4,500 feet elevation ; August. (590.) 
Franseria^ Hookeriana, Nutt. Annual, much branched, 1-2° high ; 
the corolla tubular, more or less enlarged at tlie throat, ^vith four ovate spreading teeth. Scales of the 
iuvolucre in one or two series, oblong, niembranaceons, keeled, oiie-nri vi il, Wm- a])cx eiliate. I^m i iit.n Ic 
naked, flat, foveolate. Anthev-eells somewhat produced at the base. Stvlc of the disk-dowevs with 
narrow flattened branches produced into a subuhitc hispid appcixhige. Aelieuia oblong, flattened, witli 
a single nerve at each margin. rap\»ns either none or of a single stout scabrous bristle, rather lungi r 
than the aclieninni, or (in a doubtfrd species) of about 2U such bristles.— Low iicrcimials, with many 
stems rising from a stout woody candex ; the leaves o]iposit(i or alternate, siuall, toothed or nniltilid, 
punctate or dotted with resinous globules; heads solitary or in tiTininal coryi!d)s, the flowers yellow. 
Natives of Utah, New Mexico and Texas, or extending into Mexico. 
' FRANSEEIA, Cavaxiixks, Heads of two sorts, the fertile ones at the base, and the sterile ones 
composing the upper portion of the raeenu\s or spikes. Fertile h(>ads with an ovoid (U- oblong close<l 
iuvolucre composed of nuuK'rons united scales, the tips free and spiuesciMit or hi>oked; corolla none (>r 
rndimentary; style with filiform obtuse branches ; achenia ohlong ; ]i:ippns none. Sterile heads lieini- 
spherical, the 12-20-flowered cup-shaped involucre of 6-\2 united scales ; reeeptac]<- llattish, with lilifonu 
chaff"; corolla funnel-shaped, 4-5-toothed ; anthers tipped with a slender inllcxcd appendage ; ovary none ; 
style radiato-penicillate at summit.- Herbs or suti'rutesecnt plants ; the leaves alternate, coarsely toothed 
or lobed, or even bipiunatifid. Natives of America, from the Saskatchewan to Peru. 
