Part 1, 1914] CARDUACEAE : HELENIEAE 55 



DOUBTFUI, AND EXCLUDED SPECIES 



Hymenopappus Engelmannianus Kunth, Ind. Sem. Hort. Berol. 15. 1848. — Ann. Sci. 

 Nat. III. 11 : 228. 1849. This is a species of the H. scabiosaeus group and may be H. scabio- 

 saeus, 11. corymbosus, or II. sulphureiis, or a distinct related species; but which cannot be told 

 from the description. 



Hymenopappus matricarioides Spreng. Syst. 3: 450 (1826) is an Ageratum. 



37. LEUCAMPYX A. Gray (Benth. &Hook. Gen. 2: 422; hyponym. 



1873); Porter & Coult. Syn. Fl. Colo. 97. 1874. 



More or less floccose perennial herbs. Leaves alternate, bi- or tri-pinnatifid into narrow 

 linear segments. Heads corymbose, peduncled, radiate. Involucre hemispheric; bracts in 

 2-3 series, subequal, broad, with scarious colored tip and margins. Receptacle convex, with 

 broad, membranous paleae, half enclosing the achenes. Ray-flowers present, pistillate, 

 fertile, with slender tubes and broad 3-toothed or 3-cleft, white ligules. Disk-flowers her- 

 maphrodite, fertile; tube glandular; throat campanulate; lobes ovate, spreading. Style- 

 branches penicillate, with short appendages. Anthers obtuse at the base. Achenes of the ray- 

 flowers cuneate, sub-3-gonous, with rounded back, striate; those of the disk-flowers some- 

 what compressed, 5-gonous; all more or less incurved, glabrous, striate and muriculate. 

 Pappus a minute crown. 



Type species, Leucampyx Newberryi A. Gray. 



1. Leucampyx Newberryi A. Gray; Porter & Coult. Syn. Fl. Colo. 



77. 1874. 

 A somewhat floccose perennial; stem 2-3 dm. high, corymbosely branched; leaves 1-1.5 

 dm. long, somewhat floccose above, tomentose beneath, with narrowly linear segments; in- 

 volucre about 6 mm. high and 1 cm. broad; bracts obovate; ligules white, 10-12 mm. long, 

 6-7 mm. broad; disk-corollas 4 mm. long, light-yellow; achenes 4-5 mm. long; paleae of the 

 receptacle about 6 mm. 



Type locality: New Mexico. 



Distribution: Southern Colorado and New Mexico. 



38. HYMENOTHRIX A. Gray, Mem. Am. Acad. II. 4: 102. 1849. 



Annual (?) herbs. Leaves alternate, petioled, bi- or tri-ternately dissected into linear 

 or oblong, entire or cleft divisions. Heads radiate, corymbose.* Involucre turbinate; bracts 

 about 10, lanceolate-oblong, equal, in about two series, with yellowish and more or less scarious 

 tips. Receptacle small, papillose. Ray-flowers 8-10, pistillate, fertile ; ligules light-yellow, ob- 

 long-cuneate, 3-toothed at the apex. Disk-flowers many, hermaphrodite, fertile; corolla-tube 

 slender, glandular-puberulent, about equaling the cylindro-campanulate throat; lobes ovate, 

 shorter than the throat. Anthers not caudate at the base, with ovate appendages at the apex. 

 Style-branches linear with short conic appendages. Achenes linear-obpyramidal, obtusely 

 4-5-angled. Pappus of about 12 equal narrow subulate slightly scarious squamellae, with a 

 prominent midrib excurrent into a barbellate awn. 



Type species, Hymenothrix Wislizeni A. Gray. 



1. Hymenothrix Wislizeni A. Gray, Mem. Am. Acad. II. 4: 102. 



1849. 



Hymenopappus Wislizeni setiformis M. E. Jones, Contr. W. Bot. 12: 475. 1908. 



A tall herb; stem 5-7 dm. high, minutely puberulent, striate; leaves 5-10 cm. long, bi- 

 or tri-ternate with linear or oblong divisions, minutely strigulose; heads numerous, corymbose- 

 paniculate; involucre turbinate, 5 mm. high and broad; ligules 3-4 mm. long; disk-corollas 

 yellow; tube and the throat each about 2 mm. long; achenes 3-4 mm. long, 0.5 mm. broad, 

 sparingly hirsutulous; pappus about 3 mm. long. 



Type locality: Ojo de Gallejo, Chihuahua. 

 Distribution: New Mexico, Arizona, and Chihuahua. 



