Burrobrush

Hymenoclea pentalepis Rydberg, sp. nov
A shrub about 1 m. high, with straw-colored bark; branches slender, spreading; leaves
rather few, filiform, 1-3 cm. long, glandular-punctate, apparently glabrous; staminate heads
few, mixed with the numerous pistillate ones or above them; involucre turbinate, about 3 mm.
wide, glandular-puberulent; lobes 6 or 7, ovate; paleae of the receptacle oblanceolate, shorter
than the corolla; corolla funnelform, puberulent; anthers with acute incurved tips; style of the
rudimentary pistil shorter than the stamens; stigma penicillate; pistillate heads subtended by
a few short leaf-like bractlets and a single obovate hyaline scale; body of the fruit about 6 mm.
long, fusiform; wings usually 5, broadly obovate-flabelliform, usually short-cuspidate, with a
very short and broad petiole-like base; beak about 2 mm. long.
Type collected in Pima Canon, Arizona, April 10, 1901, David Griffiths 2630 (herb. N. Y. Bot. Card j.
Distribution: Arizona, Sonora, Lower California, and southern California.

Hymenoclea fasciculata A. Nelson, Bot. Gaz. 37: 270. 1904
Hymenoclea fasciculala patula A. Nelson, Bot. Gaz. 47: 431. 1909.
A shrub 3-10 dm. high, with yellowish-green or straw-colored bark; branches often fasciculate; leaves filiform or linear, 1-4 cm. long, entire or with filiform, divaricate lobes, puberulent, somewhat involute, canescent, tomentulose beneath; staminate heads 15-20-flowered, mostly spicate on the ends of the branches above the pistillate ones, but also mixed with them; involucre more or less turbinate, 3-4 mm. wide, puberulent; lobes 6 or 7, ovate; paleae of the receptacle spatulate, nearly as long as the corollas; corollas funnelform, puberulent; style longer than the stamens; stigma penicillate; pistillate heads subtended by 3 or 4 cordate-deltoid ciliate bractlets; body of fruit fusiform, 4-5 mm. long, with about 12 scales in 3-4 series; beak 2 mm. long; wings broadly reniform, concave, when dry imbricate like a cone, without petiolelike bases and pits.
Type locality: Kernan, southern Nevada. Distribution: Nevada.