COMPOSITAE (COMPOSITE FAMILY) 539 



long: heads very numerous, in small glomerules terminating the stem or 

 branches; involucre campanulate, the bracts linear, with glabrous, white, acute 

 tips. Borders of ponds and damp places; British Columbia to California and 

 the Rocky Mountains. 



5. Gnaphalium angustifolium A. Nels. Bull. Torr. Bot. Club 26: 357. 

 1899. Low annual, branching from the base; stems decumbent-spreading 

 or assurgent, 8-12 cm. long, loosely floccose on the stems and involucres, 

 appressed-pubescent on the leaves: leaves narrowly to broadly linear, 2-4 cm. 

 long: the small heads glomerate in the axils, the upper internodes very short 

 forming a congested leafy cluster: heads moderately involved in wool, about 

 3 mm. high; involucral bracts lanceolate, acutish, the scarious tips white, 

 brownish below: achene roughened with short, cylindrical papillae. Moist 

 places; Wyoming and Colorado. 



6. Gnaphalium strictum Gray, Pac. R. Rep. 4: 110. 1858. Appressed- 

 woolly; stem strict and simple, 1-2 dm. high, sometimes branching or with 

 ascending stems from the base: leaves all linear, seldom 2 mm. wide: heads 

 in spicately disposed glomerules in the axils or on short lateral branches; 

 involucral bracts with brownish or somewhat whitish tips, obtuse. Rocky 

 Mountain region, from Wyoming to New Mexico and Arizona. 



36. MELAMPODIUM L. 



Annual or perennial small caulescent herbs or shrubby plants. Leaves 

 opposite; blades often narrow, thickish, entire, toothed, or pinnatifid. Heads 

 radiate, sometimes conspicuous. Involucre double, the outer of 4-5 partially 

 united flat bracts, the inner a series of bracts each embracing an achene 

 and deciduous with it, but unarmed. Receptacle convex or conic. Ray- 

 flowers in 1 series, pistillate; li gules white or yellow; disk-flowers perfect 

 but not fruit-producing. Anthers entire at the base. Achenes broadened 

 upward, somewhat incurved. Pappus wanting. 



1. Melampodium cinereum DC. Prodr. 5: 518. 1836. Branched from the 

 base, 1.5-3 dm. high, cinereous or even silvery-canescent with a close pubes- 

 cence, or greener: leaves linear or the lower lanceolate or spatulate, entire or 

 undulate, or even sinuate-pinnatifid : ligules 5-9, cuneate-oblong, 2-3-lobed 

 at apex, 6-12 mm. long; bracts of the involucre ovate, appressed, slightly 

 united at base; fructiferous bracts nearly terete, somewhat incurved, muri- 

 cate with sharp tubercles ; the hood about the length of the body and very 

 much wider, nearly smooth, the truncate and usually even margin commonly 

 incurved. (M. leucanthum T. & G.) Southern Colorado to Arkansas, Texas, 

 and Arizona. 



37. PARTHENICE Gray 



Tall branched annual. Fertile flowers 6-8, with ligule obsolete or reduced 

 to 2 or 3 small teeth; sterile flowers 40 or 50, with funnelform corolla. In- 

 volucre of 5 somewhat herbaceous oval exterior bracts, and of 6 or 8 somewhat 

 larger orb icular-ob ovate and more scarious interior ones, these subtending the 

 fertile flowers. Receptacle convex, with linear-oblong or spatulate chaffy 

 bracts subtending the outer series of sterile flowers, but mostly minute or 

 wanting to the inner flowers. Achenes pblong-obpvate, glabrous, wingless 

 but acute-margined, with an incurved apiculation, inserted by a very small 

 base, falling away at maturity with the involucral and 2 receptacular bracts, 

 but these readily separating. Pappus none, and corolla deciduous. 



1. Parthenice mollis Gray, PI. Wright. 2: 85. 1853. Annual, with odor of 

 Artemisia, 1-2 m. high, paniculately branched, minutely cinereous through- 

 out, wholly destitute of any coarser pubescence: leaves all alternate, ovate, 

 some of the larger (2-3 dm. long) subcordate, acuminate, irregularly or doubly 

 dentate, long-petioled : heads small, 4 mm. broad, numerous, in loose axillary 

 and terminal somewhat leafy panicles: flowers greenish- white. Southern 

 Colorado to Arizona. 



