572 POLYGONACE ERIOGONUM 
slender dcflexed pedicels an inch long or less, 5-cleft to near the middle: 
flowers whitish, campanulate, half a line long, fiddle-shape. On dry plains, 
eastern Oregon to Nebraska and New Mexico. 
* * Annuals, branching from the base, with leaves developed at | 
the nodes in the axils of ordinary triangular bracts: flowers minutely 
glandular. 
E. angulosum Benth. Trans. Linn. Soc. xvii, 406, t. 18. Floccose- 
woolly, or at length glabrate: stem erect, 4-12 inches high, leafy, branech- 
ing into a repeatedly di-or trichotomous panicle; the branches acutely 4-6 
angled: radical leaves spatulate or rounded, the cauline oblong-linear to 
lanceolate: pedicels 6-12 lines long, widely spreading: involucres short- 
campanulate or hemispherical, minutely glandular or almost smooth, soli- 
tary, many-flowered, 5-toothed becoming dilated in fruit: flowers very obtuse 
at base, a line long, on short pedicels, rose-color or white, deeply 5-parted, 
the outer segments ovate, the inner at length longer, lanceolate-oblong. 
Eastern Oregon to California and Utah. 
* * * Tall stout white-tomentose annuals, with leafy simple stems, 
naked above : inflorescence cymose : involucres turbinate-campanulate, _ 
shortly pedicelled : flowers white, nearly glabrous: sepals very unequal. 
E. annuum Nutt. Trans. Am. Phil. Soe. Ser. 2. v, 164. Flowers 
tomentose throughout: stem 1-3 feet high, leafy below: leaves oblong-lanc- 
eolate or oblanceolate, narrowed at base to a petiole, the margins somewhat 
revolute or crisped: involucres turbinate 1-1}¢ lines long secund, erect, 5 
toothed : calyx 44-1 line long, the segments obovate. On dry plains Idaho 
to Nebraska and Texas. My | 
§ 3 Involucres cylindric-turbinate, moré or less strongly 5-6 
nerved, often becoming costate or angled, with as. many short 
erect teeth, mostly sessile in heads or clusters, scattered in cymes 
or along virgate panicled branches, always erect, 1-3 lines long: 
bracts ternate, connate at base, usually short, acute and more or 
less rigid: flowers not attenuate at base : achenes usually glabrous. 
* Cespitose densely tomentose perennials with short closely branch- 
ed caudex: involucres a single head or short cymose umbel on the. 
naked peduncle: outer sepals broad and somewhat cordate, the inner 
much narrower: ovary scabrous above. 
E. ovalifolium Nutt. Journ. Philad. Acad. vii, 50, t. 8. Densely 
white-tomentose and silvery: stems very short and deprcssed-cespitose, 
perennia:; leaves broadly oval or oblong, the blade 3-10 lines long, acutish, 
abruptly narrowed to a long slender petiole, crowded upon the numerous 
short branches: scapes 3-9 inches high simple, naked, bearing a single head 
of 3-8 closely sessile 5-8 toothed involucres: calyx very glabrous, yellow or 
rose-color, becoming thin and scarious, after flowering, the segments very 
unequal, the outer very broadly oval, cordate at base: the inner spatulate, 
emarginate. On dry hillsides, eastern{Brit. Columbia to California and 
»the Rocky Mountains. 
\ Var. proliferuam Watson Proc. Am. Acad. xii, 63. Larger than the 
type, the involucres loosely cymose-umbellate. With the type. 
E. vineum. Small Bull. Torr. Bot. Club xxv, 45. Closely white-tomen- 
tose up to the inflorescence: perennial from a stout tap-root: stems branch- 
ing, the branches tufted, clothed with the persistent leaf bases: leaves 
crowded, the blades suborbicular or broadly oval, 3-5 lines long obtuse or 
rounded at the apex. abruptly narrowed or truncate at base: on petiol es 
often as long as the blade: scapes erect, 1-4 inches long, simple: involucre s 
