542 POLYGONACEAE. 
1. Macounastrum Islandicum (1. ) Small. 
Macounastrum. (Fig, 1285.) 
Koenigia Islandica I,, Mant. 35. 1767. 
Stems very slender, 1/-4’ long, sometimes tufted. 
Leaves obovate, oblong or almost orbicular, 1//-5/’ 
long, fleshy, obtuse at the apex, sessile or short-peti- 
oled; ocreae about %4’’ long; involucre consisting of 
3-6 obovate or orbicular leaves more or less united at 
their bases; flowers fascicled in the involucres, short- 
pedicelled; calyx 1%4’’ long, the segments ovate-lan- 
ceolate, rather obtuse; stamens very short; style- 
branches short; achene less than 1/’ long, brown, 
often slightly curved, striate, its faces convex. 
Greenland and Labrador to Hudson Bay and Alaska. 
Also in arctic Europe and Asia, Summer. 
2. ERIOGONUM Michx. Fl. Bor. Am. 1: 246. 1803. 
Aunual or perennial acaulescent or leafy-stemmed herbs, some species very woody at 
the base, with simple or branched, often tufted stems, and entire alternate opposite or whorled 
leaves. Flowers small, fascicled, cymose, umbellate or capitate, subtended by 5-S-toothed 
or cleft campanulate top-shaped or almost cylindric involucres. Calyx 6-cleft or 6-parted, 
usually colored, the segments equal or the outer ones larger. Stamens 9g, included or ex- 
serted; filaments filiform, often villous; anthers oblong. Style 3-parted; stigmas capitate. 
Achene pyramidal, 3-angled, more or less swollen near the base, invested by the calyx-seg- 
ments, or winged. Embryo axial or somewhat eccentric. [Greek, referring to the woolly 
and jointed stems. } 
About 160 species, natives of America, nibaeay of the western United States. 
Stem leafy to the summit. 
Stem leaves alternate; stem strigose. 
Achene glabrous, winged in fruit. 
Achene villous, not winged 
Stem leaves whorled; stem tomentose. 
Robust; basal leaves rounded at the base; flowers yellow. 
Slender; basal leaves narrowed at the base; flowers white or pink. 
Stem leafy below, naked above. 
E. alatum. 
. longifolium. 
be 
E 
E. 
E. Alleni: 
E. Jamesii. 
E 
EB 
E 
Pw 
Involucres erect on branches of the cymes. 5. E. annuum. 
Involucres in axillary and terminal clusters. 
Leaves narrowly oblong or oblanceolate, flat, long-petioled. 6. E. microthecum. 
Leaves oblong, more or less crisped, short-petioled. 7. E. corymbosum. 
Acaulescent; scapose; scapes more or less tufted. 
Scape simple; inflorescence capitate. 
Densely tomentose; leaves spatulate, numerous. 8. E. multiceps. 
Slightly tomentose; leaves linear or linear-spatulate, few. g. E. paucifiorum. 
Scape branched at the summit. 
Inflorescence regularly umbellate. 10. E. flavum, 
Inflorescence irregularly umbellate or paniculate. 11. £, lachnogynum, 
Inflorescence cymose. 12. E. campanulatum., 
Scape branched throughout; involucres solitary on deflexed peduncles. 13. £. cernuum. 
1. Eriogonum alatum Torr. Winged 
Eriogonum. (Fig. 1286.) 
EE. alatum Torr. Sitgreaves’ Rep. 168. fi. 8. 1853. 
Perennial by a long thick root, stem rather stout, 
erect, strigose, paniculately branched, somewhat ang- 
led, 1°-3° tall. Leaves mostly basal, spatulate, oblan- 
ceolate or narrowly obovate, 1/-3’ long, those of the 
stem alternate, nearly linear, short-petioled, all obtuse 
or subacute at the apex, glabrous or pubescent and 
with midrib prominent beneath, ciliate; panicle open; 
bracts lanceolate or subulate; involucres cymose at the 
ends of the branches, campanulate, 5-toothed, 1/’-1 14’ 
long, the segments obtuse and somewhat reflexed; 
calyx yellowish, 1’’ long, campanulate; stamens 
slightly exserted; achene long-pointed, 2'%4//-3/’ 
long, reticulated, closely invested by 3 wings. 
On plains, western Nebraska to Texas, west to Colorado 
and New Mexico. June-Sept. 
