58 
POLYGONACEAE 
or even cleft, or fan-shaped, or obcordate; flowers reddish, less than 2 
mm. long.—Shade of oaks or rocks. 
6. CHORIZANTHE R. Br. 
Leaves mostly basal, disappearing early, the cauline leaves mostly re¬ 
duced to bracts. Flowers 1 or several in a 3 or 6-toothed involucre, the 
teeth cuspidate or awned. Flowers included within the involucre or the 
calyx protruding. Calyx 6-parted or -cleft, colored. Stamens 9, 6 or 3. 
(Greek chorizo, to divide, and anthos, flower, on account of the parted 
calyx.) 
Involucre urnshaped, the teeth bordered by a broad scarious membrane. 
1. C. membranacea. 
Involucre cylindric, not scarious-margined.-.2. C. staticoides. 
1. C. membranacea Benth. Erect, 1.4 to 4.3 dm. high, simple below, 
branching above; leaves linear, sessile or short-petioled, glabrous above; 
involucres in solitary capitate clusters along the branches or almost ter¬ 
minal, white-scarious between the teeth; calyx woolly.—Foothills. 
2. C. staticoides Benth. Turk’s Rug. Stems 1 or several from the 
base, cymosely dichotomous, 9.6 to 24 cm. high, fragile at the joints; 
leaves reddish, soft-pubescent or grayish, white-woolly underneath ; in¬ 
volucres sessile, congested at the end of the branchlets or at the joints; 
calyx white to deep rose, exserted.—Dry sandy plains and foothills. 
7. ERIOGONUM Michx. 
Leaves alternate or whorled, or often wholly basal, without stipules. 
Flowers several to many in a 4 to 8-toothed or -lohed involucre. Pedicels 
of the flowers more or less exserted, intermixed with narrow bractlets. 
Calyx colored, 6-parted or -cleft, persistent. Stamens 9. Styles 3. Stig¬ 
mas capitate. (Greek erion, wool, and gonu, knee or joint, the nodes 
hairy in some species.) 
Calyx not stipe-like at base ; involucres turbinate or cylindric. 
Involucres turbinate, not angled, on scattered pedicels; inner and outer 
calyx-lobes very unlike.1. E. angulosum. 
Involucres cylindric, angled, always sessile. 
Involucres solitary, usually scattered. 
Stems, leaves and involucres white-woolly.2. E. virgatum . 
Stems glabrous, rarely a little woolly below.3. E. vimineum. 
Involucres 2 to several in heads, rarely solitary. 
Shrubs, at least woody at base ; stems very leafy. 
Heads terminal on the 2-forked peduncles, or racemosely dis¬ 
posed on the forks ; leaves mostly ovate or roundish.... 
4. E. parvifolium. 
Heads umbellate, sometimes solitary and terminal; leaves oblong 
or linear.5. E. fasciculatum. 
Herbaceous or mostly so, leafy only at base. 
Stems not fistulous; heads 1 or few.6. E. latifolium. 
Stems fistulous; heads several to many.7. E. nudum. 
Calyx stipe-like at base ; involucres in umbels.8. E. umbellatum. 
1. E. angulosum Benth. Diffusely branching from near the base, the 
branches 2-forked and 4 to 6-angled; basal leaves roundish to broadly 
oblong, on short petioles, the upper mainly lanceolate and sessile or nearly 
so; filiform stalks of the glabrous involucres terminal or borne in the 
forks; bractlets firm and rather broad; calyx-divisions pink with a red- 
purple midvein; outer divisions ovate, the inner narrower.—Hills and 
plains. 
