Part 1, 1914] CARDUACEAE : HEIvENIEAE 49 



2. Hymenopappus Nelsoni (Greenman) Rydberg, sp. nov. 



Hymenothrix glandulosa Nelsonii Greenman Proc. Am. Acad. 40: 46. 1904. 



A leafy-stemmed annual; stem 5-6 dm. high, striate, glandular-villous below, somewhat 

 tomentulose above; leaves rhombic in outline, bipinnatifid into linear obtusish divisions, some- 

 what pubescent; heads numerous in corymbs or flat- topped panicles; involucre about 6 mm. 

 high, nearly 1 cm. broad; bracts broadly obovate, rounded at the apex, slightly pubescent, 

 yellow, often tinged with purplish; corollas yellow; tube nearly 2 mm. long, the lanceolate 

 lobes equaling the broadly campanulate throat; achenes 3 mm. long, silky-hirsute on the 

 angles; squamellae oblong-obovate, muticous or rarely slightly awn-pointed. 



Type locality: Sierra Madre near Colonia Garcia, Chihuahua. 

 Distribution: Known only from the type locality. 



3. Hymenopappus Palmeri (A. Gray) O. Hoffm. in E. & P. Nat. Pfl. 



4^: 256. 1890. 

 Hymenothrix Palmeri A. Gray, Proc. Am. Ac^d. 21: 391. 1886. 



A leafy-stemmed biennial or perhaps annual; stem 5-7 dm. high, striate, glabrous or 

 nearly so; leaves rhombic in outline, bipinnatifid into linear or oblanceolate, obtuse or acutish 

 divisions, puberulent or glabrate; heads numerous in dense corymbs; involucre about 6 

 mm. high, and 1 cm. broad; bracts obovate or oblanceolate, acutish, glabrous, mostly scarious; 

 corollas yellow; tube 1.5-2 mm. long, the lanceolate lobes equaling the broadly campanulate 

 throat; achenes 3 mm. long, silky-hirsute on the angles, sparingly pubescent but glabrate on 

 the indistinctly veined faces; squamellae of the marginal achenes usually oblong, muticous, 

 1 mm. long, those of the rest lanceolate, fully 2 mm. long and with excurrent midrib. 



Type locality: In the mountain district 150 miles north of Batopilas, Chihuahua. 

 Distribution: Chihuahua to Durango. 

 Illustration: E. & P. Nat. Pfl. 4^:/. 124, J. 



4. Hymenopappus scabiosaeus L'Her. Hymenop. 1. 1788. 



Rothia caroliniensis Lam. Jour. Hist. Nat. 1: 17. 1792. 

 Hymenopappus laxifloriis L'Her.; DC. Prodr. 5: 658, as synonym. 1836. 

 Hymenopappus caroliniensis Porter, Mem. Torrey Club 5: 338. 1894. 



A leafy-stemmed biennial; stem 3-7 dm. high, angled, often pui-plish, glabrate or spar- 

 ingly floccose, corymbosely branched; leaves alternate, the earlier ones oblanceolate, merely 

 cleft or sometimes nearly entire; stem-leaves once or twice pinnatifid with linear or sometimes 

 oblong divisions, 5-15 cm. long, sparingly floccose, green and glabrate above, grayish-floccose 

 beneath; heads corymbose; involucre 7-8 mm. high, 10-15 mm. broad; bracts obovate, 

 mostly bright-white; corollas ochroleucous ; tube about 2 mm. long; throat campanulate, 1.5 

 mm. long; lobes oblong, about as long as the throat; anthers and a part of filaments exserted; 

 achenes obconic, 4 mm. long, short-hirsute; squamellae less than 1 mm. long. 



Type locality: South Carolina. 



Distribution: South Carolina to Kansas, Texas, and Florida. 



Illustrations: L'Her. Hymenop. pi. ; Jour. Hist. Nat. 1 : pi. 1: Lam. III. pi. 667; Britt. & Brown 

 111. Fl. /. 3960; ed. 2. /. 4529. 



5. Hymenopappus sulphureus Rydb.; Britton, Man. 1007. 1901. 



A leafy-stemmed biennial; stem 3-6 dm. high, permanently white-tomentose, branched 

 above; lower leaves pinnately divided into oblong or linear lobes, white-tomentose beneath, 

 sparingly floccose and glabrate above; stem-leaves twice pinnatifid with linear divisions; 

 heads corymbose; involucre 7 mm. high, 10-12 mm. broad; bracts obovate, with sulphur- 

 yellow tips; corollas ochroleucous; tube 2 mm. long; lobes oblong, about equaling the cam- 

 panulate throat, 1.5 mm. long; anthers exserted; achenes 3.5-4 mm. long, strongly striate, 

 hirsutulous on the angles. 



Type locality: Kansas. 



Distribution: Kansas to Texas. 



Illustrations: Britt. & Brown, 111. Fl. /. 3961; ed. 2. /. 4530 (both as H. corymhosus) . 



