SUNFLOWER FAMILY 145 
ee ae fusiform, angled below, terete and tubular-beaked above, indurated, bearing about 
5-12 cuneate or oblanceolate to flabella “i horizontal, scarious wings either in a single whorl 
at tidale or spirally from base to middle or rarely above it. Staminate corollas funnelform, 
5-toothed, somewhat glandular ; pistillate flowers Aithout corolla. Stamens 5; filaments usu- 
ally lightly connate to middle or nearly to apex; anthers lightly coherent, with s sagittate bases 
and deltoid, inflexed, terminal appendages. Style in staminate flowers undivided, dilated at 
apex and there fimbriate; in pistillate flowers with 2 linear, obtuse, exserted, stigmatic 
branches. Achene aap enclosed by the fruiting involucre, obovoid-fusiforn n, black- 
ish brown, aes epappose. [Name Greek, meaning enclosing membrane. 
Ag of cies, ot 3 ‘the southwestern United States and northern Mexico. Type species, Hy- 
wekoctee pene Purr: “& Gra 
Wings of fruiting involucre spirally arranged, 5-8 mm. wide. . H. salsola. 
Wings vie dei involucre in a.single whorl, or » 1 or 2 ces wings above or below ae 1-5 mm. 
s 5-7, flabellate or reniform-orbicular 
wide 
— 
Wings 7-12, mostly cuneate or obovate, 1-2 n mm. Sie. mon 
1. Hymenoclea salséla Torr. & Gray. White Burrobush. Fig. 5213. 
Hymenoclea salsola Torr. & Gray ex A. om y, — — Acad. IT. 4: 79. 4 
Hymenoclea fasciculata A. Nels. Bot. Gaz. 270. 
Hymenoclea fasciculata var. patula A. Sea op. cit. fs ae 1909. 
Shrub 1-2 m. high, erectish or spreading-branched ; branches sparsely hispidulous when young. 
Leaves igre deciduous ai pt from the younger branches, pica r linear-filiform, 2-6 cm. long, 
e, € or sintately few-lobe a) obtuse, green and often sparsely hispidulous 
beneath, Abauely eanescent- hispidulous and often rongly Raabe De -marg — above; heads - 
mixed or the staminate often above the pis a. pre ee or solitary in the aah of te 
—. iis te involucre about >, mm. wide, owered; nistillate involucre tu = sig 
siform, abou mm. long, _itagnel wg iboat 12 spirally arranged, suborbicular or 
flabellate, often mucronate, scarious wing mm. wide, their broad, short, stipe-like bases 
usually deeply sineAs teal cone- ike gee dry, 12-14 mm. in diameter when wings are opened. 
Desert washes and alkaline ao, Lower Sonoran Zone and lower part of Upper Sonoran Zone; San Joaquin 
Valley in eles County, California, and eastern Santa Barbara and Ventura Counties (Cuyama Valley: ; Mount 
Pinos region) southward along the pees slopes of the mountains to San Diego County and eastward across the 
Mojave Desert and ranges of the Death Mer J region to southern Nevada, te rn Arizona, and southern Utah. 
pape apeality: uplands of the Suiace River, San Bernardino County, California. Collected ag Fremont. March- 
July. Desert Pearl. 
2. Hymenecies ere = Southern Burrobush. Fig. 5214. 
H lea pentalepis Rydb. N. Amer. FI. 33: 
Hymenoclea Ange Mee Nels. Amer. Journ a 25: 11 17. 1938. 
iemenecies salsola var. pentalepis L. Benson, op. cit. 30: 631. 1943. 
tricately cre shrub about 1 m. later weg — dioecious or essentially so, specced 
slender, prea andular-granular and m or less resinous, sparsely hispidulous when 
Leaves mostly rciceas incites filiform, entire mn nati pie lobed, 0.5-5 cm. long, about 0.5 m 
5212. Dicoria clarkiae 5213. Hymenoclea salsola 
