WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 913 
12. Amaranthus graecizans L. Sp. Pl. 990. 1753. TUMBLEWEED. 
Amaranthus albus L. Syst. Nat. ed. 10. 2: 1268. 1759. 
Type LocaLity: ‘Habitat in Virginia.”’ 
Rance: A common weed in temperate and subtropical North America. 
New Mexico: Common throughout the State. 
A widely spreading tumbleweed, common in the drier and warmer cultivated parts 
of the State. Young plants are leafy and rather succulent, but in age the stems be- 
come rigid, yellowish, and covered with the very numerous spiny fruiting bracts and 
later, scalelike leaves which are also spiny-tipped. The dead plants form part of the 
pile of tumbleweeds commonly seen along the fences, where they are associated with 
the Russian thistle and bugseed. 
13. Amaranthus pubescens (Uline & Bray) Rydb. Bull. Torrey Club 39: 313. 
1912. 
Amaranthus graecizans pubescens Uline & Bray, Bot. Gaz. 19: 317. 1894. 
TyPE Locauity: Silver City, New Mexico. Type collected by Greene in 1880 
(no. 185). 
Rance: New Mexico and Arizona, 
New Mexico: South of Santa Fe; Mule Creek; Cliff; Fort Bayard; chalk hills near 
Parkers Well. Open hills, in the Upper Sonoran Zone. 
This seems to be one of the most distinct forms of the genus and should certainly 
receive specific rank. It differs decidedly from A. graecizans in its lower habit, its 
pubescence, and the crisped leaves. 
2. ACANTHOCHITON Torr. 
An erect branching annual, with glabrous, green and white striped stems and alter- 
nate lanceolate aristate-tipped leaves; flowers dicecious or sometimes moneecious, the 
staminate with 5 sepals but bractless, the pistillate without sepals, subtended by a 
cordate clasping scale, this accrescent and spiny in fruit. 
1. Acanthochiton wrightii Torr. in Sitgreaves, Rep. Zufii & Colo. 170. 1853. 
Type Locatity: Western Texas, 
Ranae: Western Texas to Arizona. 
New Mexico: Shiprock; Chama River; San Marcial; Deming; Mesilla Valley; 
Organ Mountains; Jarilla Junction; Sabinal. Sandhills, in the Lower and Upper 
Sonoran zones. 
The plant might easily be taken for an Amaranthus when in flower, but the fruiting 
plant is very strongly marked and easily recognized by the enlarged bracts. It is a 
common garden and roadside weed on sandy soils in the southern part of the State. 
3. CLADOTHRIX Nutt. 
Diffusely spreading or ascending herbaceous annuals or perennials, densely covered 
with white stellate pubescence; leaves petiolate, ovate to obovate; flowers very small, 
yellow, in small axillary clusters. 
KEY, TO THE SPECIES. 
Perennial; stems erect or ascending; leaves truncate or rounded at 
the base. .....-...-...---2022- 22-222 eee eee cae ee ee eeeeeee 1. C. suffruticosa. 
Annual; stems prostrate; leaves attenuate at the base............ 2. C. lanuginosa. 
1. Cladothrix suffruticosa (Torr.) Benth. & Hook.; 8. Wats. Bot. Calif. 2: 43. 
1880. 
Alternanthera ? suffruticosa Torr. U. 8S. & Mex. Bound. Bot. 181. 1859. 
Tyrr Locauiry: Mountains near Frontera and between the Pecos and the Limpio, 
western Texas. 
