BUCKWHEAT FAMILY 



405 



Fig. 72. a, ERIOGONUM GBACILLIMUM Wats., invo- 

 lucre; b, flower; c, E. ANGULOSUM Benth., in- 

 volucre; d, flower. Involucres, x 4; flowers, x 10. 



I. SUBGENUS Ganysma. 



Involucres 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 Benth. (Fig. 

 72c, d.) Steins diffusely and re- 

 peatedly dichotomous from near 

 the base, 3 to 14 (or 24) inches 

 high, the branches 4 to 6-angled; 

 stems and leaves whitish tomen- 

 tose, or glabrate and green; basal 

 leaves roundish to broadly oblong 

 or lanceolate, commonly undulate, 

 1/2 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, y 2 to % line 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 Mohave 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 y 2 to % inch wide; involucre more deeply 

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

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



Kefs. ERIOGONUM ANGULOSUM Benth. Trans. Linn. Soc. 17: 406, t. 18, fig. 1 (1837), type 

 from California, Douglas. Var. flabellatum Gand. Bull. Soc. Koy. Bot. Belg. 42: 187 (1905), 

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

 E. viridescens Heller, Muhl. 2: 25 (1905), type loc. Sunset, Heller 7733. Var. MACULATUM 

 Jepson. E. maculatum 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 1% 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), 5615 (Victor); San Emigdio, Kern Co., 

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



