14 NORTH AMERICAN FLORA [VOLUME 33 
Type species, Hymenoclea Salsola T. & G. 
Wings of the fruit in several series. 
Fruit, including the beak, about 8 mm. long; wings with distinct petiolar 
concave bases, with pits in their axils. 1. H. Salsola. 
Fruit, including the beak, about 6 mm. long; wings without petiolar bases 
bases and pits. 2. H. fasciculata. 
Wings of the fruit in a single radiating series above the middle of the fruit- 
body. 
Wings usually 5, broadly obovate-flabelliform; fruit, including the beak, 
nearly 8 mm. long. 3. H. pentalepis. 
Wings 7-12, oblanceolate or obovate; fruit, including the beak, about 
6 mm. long. 4. H. monogyra. 
1. Hymenoclea Salsola T. & G.; (Torr. in Emory, Notes Mil. Rec. 143, 
hyponym. 1848) A. Gray, Mem. Am. Acad. II. 4: 79. 1849. 
Hymenoclea polygyra Delpino, Studi Lign. Anem. 73, hyponym. 1871. 
A shrub 1-2 m. high, with straw-colored bark; branches more or less spreading; leaves 
filiform, 3-5 mm. long, about 0.5 mm. wide, finely pilosulous, and slightly white-tomentulose 
beneath; staminate heads mixed with or above the pistillate ones, sessile; involucre saucer- 
shaped, 15—20-flowered, pilose; lobes 5—7, rounded and crenate; paleae of the receptacle broadly 
spatulate, pinnately veined; corolla funnelform, pubescent; rudimentary style nearly as long 
as the stamens; stigma fimbriate; pistillate heads subtended by a few linear-oblong bractlets; 
body of fruit fusiform, about 6 mm. long, with several series of scales; beak about 2 mm. long, 
hyaline; wings reniform, concave, in dry weather imbricate as a cone, their bases narrowed, 
concave, having a deep pit in the axils. 
TYPE LOCALITY: Uplands near the Mohave River, California. 
DISTRIBUTION: Southern Utah and Arizona to California'and Lower California. 
ILLUSTRATION: Torr. Pl. Frém. fl. 8. 
2. Hymenoclea fasciculata A. Nelson, Bot. Gaz.37: 270. 1904. 
Hymenoclea fasciculata patula A. Nelson, Bot. Gaz. 47: 431. 1909. 
A shrub 3-10 dm. high, with yellowish-green or straw-colored bark; branches often fascicu- 
late; 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; in- 
volucre more or less turbinate, 3-4 mm. wide, puberulent; lobes 6 or 7, ovate; paleae of the re- 
ceptacle 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 petiole- 
like bases and pits. 
TYPE LOCALITY: Kernan, southern Nevada. 
DISTRIBUTION: Nevada. 
3. 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 peticle-like base; beak about 2 mm. long. 
Type collected in Pima Cafion, Arizona, April 10, 1901, David Griffiths 2630 (herb. N. Y. Bot. 
Gard.). 
DISTRIBUTION: Arizona, Sonora, Lower California, and southern California. 
