BUCKWHEAT FAMILY 



405 



Fig. 72. a, 

 lucre; h, 

 voUuTP; 



Eriogoxum gracillimum Wats., iuvo 



flower; c, E. aNUULOSUM Bentb., in- 



/, flower. Involucres, x 4; flowers, x 10, 



I. — Subgenus Ganysma. 



In%-olueres campanulate or broadly turbinate, not angled, never congested in heads, always 

 borne on filiform and usually elongated pedicels and disposed in racemes or panicles, often 

 drooping or recurved; bracts in 3s, small, rigid, mostly oblong to triangular; calyx often ac- 

 crescent, not stipe-like at base; ovary and filaments glabrous; annuals (except nos. 9 and 10); 

 mostly of the deserts or arid plains. 



1. E. angulosum Bentb. (Fig. 

 72e, d.) Stems diffusely and re- 

 peatedly dicliotomous from near 

 the base, 3 to 14 (or 24) inches 

 high, the branches 4 to 6-angled; 

 steins and leaves whitish tonien- 

 tose, or glabrate and green ; basal 

 leaves roundish to broadly oblong 

 or lanceolate, commonly undulate, 

 I/O to 1 inch long, on rather short 

 petioles; upper leaves oblong to 

 lanceolate or oblanceolate, sessile 

 or nearly so ; pedicels of the invo- 

 lucres 3 to 8 lines long, in the 

 forks or terminal ; involucres tur- 

 binate or hemispherical. 1 line 

 long, minutely glandular, woolly 

 inside ; calyx segments white or 

 pink, 14 to % liii^ long, minutely 

 glandular-puberulent, the outer 

 (with darker centre) obovate or ovate, concave, the inner linear or lanceolate, 

 distinctly longer than the outer, all abruptly short-clawed. 



South" Coast Ranges to the upper San Joaquin Valley, Southern California, 

 the ]\Iohavc Desert, and Inyo Co. Arizona to Washington. Lower California. 

 Var. viridescens Jepson n. comb. Leaves oval to elliptic; calyx greenish. — 

 Kern Co. Possibly a seasonal abnormality. 



Var. maculatum Jepson n. comb. Close to preceding ; basal leaves oval, not 

 revolute, % to 1 inch long and 1/2 to % inch wide; involucre more deeply 

 lobed; outer calyx segments yellowish with an oblong red blotch. — Desert 

 valleys, Victor, Kramer and Earstow to Inyo Co. and north to Reno. Nev. 



Rcfs.— Eriogonum angulosum Benth. Trans. Linn. Soc. 17: 406, t. 18, fig. 1 (1837). type 

 from California, Douglas. Var. flabcllaUim Gand. Bull. Soc. Roy. Bot. Belg. 42: 187 (190.5), 

 east base of Sierra Nevada on Central Pacific R. R. Not seen by us. Var. VIRIDESCEXS Jepson. 

 IC. viridescens Heller, Muhl. 2: 2.5 (1905). tvpe loc. Sunset, Heller 7733. Var. maculatum 

 Jepson. E. mnriilatum Heller, Muhl. 2: 188 (1906), type loc. Laws, Inyo Co., Heller 8233. 



2. E. gracillimum Wats. (Fig. 72a, b.) Stems many from the base, diffuse, 

 repeatedly dichotomous and very slender above, 4 to 10 (or 24) inches high; 

 herbage thinly woolly, especially on the under side of the leaves; basal leaves 

 spreading, oblong to lanceolate, % to IV2 inches long, narrowed below, sessile 

 or shortly petioled, the cauline sessile, erect, oblong-lanceolate, acute, blistery- 

 dilated, strongly revolute, % to 1 inch long; involucres turbinate, borne on 

 filiform pedicels 4 to 8 lines long; calyx pink, minutely glandular-hispid out- 

 side, 1 line long, the tips of the segments white and erosulate ; outer segments 

 broadly oblong, erect with the white tips abruptly spreading, the edges below 

 the tips incurved; inner segments like the outer but smaller. 



Sandy soil, Mohave Desert north to the upper San Joaquin Valley and west- 

 erly to San Luis Obispo Co. 



Locs. — Mohave Desert, Jepson .5322 (Kramer), 561.5 (Victor); San Emigdio, Kern Co., 

 Davy 1968; Santa Maria River, Blochman ; Estrella, Jared. 



