160 NORTH AMERICAN FLORA [Volume 34 



1. Syncephalantha decipiens Bartl. Ind. Sem. Hort. Goett. 1836: 6. 

 1836.— Linnaea 12: 80. 1838. 



Syncephalantha macrophylja Klatt, Leopoldina 25: 108. 1889. 



A branched annual; stem 1-5 dm. high, angled, striate, hispidulous; leaves 4-6 cm. long, 



pinnately dissected into 3-7 oblanceolate serrate divisions, 1-3 cm. long, sparingly hispidulous 



on the veins and with rounded marginal glands; aggregate head about 12 mm. broad; involucre 



of the individual heads narrowly campanulate or almost obpyramidal, 6-7 mm. high, 4 mm. 



broad; bracts hispidulous, oblong, obtuse, striate and strongly keeled, with membranous tips; 



ligules orange, 5-6 mm. long, 2-3 mm. wide; disk-corollas 3 mm. long; achenes 2.5 mm. 



long, hairy; pappus yellowish, 4 mm. long. 



Type locality: Cultivated specimens, from Mexican seeds. 

 Distribution: Vera Cruz to Oaxaca. 

 Illustration: E. & P. Nat. Pfl. 4 5 :/. 126, J. 



2. Syncephalantha sanguinea Klatt, Leopoldina 25 : 106. 1889. 



A branched annual; stem 3-5 dm. high or more, angled and sparingly crisp-hairy; leaves 



2-5 cm. long, pinnately dissected into 5-9 oblanceolate or cuneate, toothed divisions sparingly 



hairy on the veins beneath, with mostly marginal oil-glands; aggregate head about 1.5 cm. 



broad; involucre of the individual heads broadly campanulate, 5-6 mm. high and about as 



broad; bracts glabrous, obovate, often purplish, striate and with membranous margins; ligules 



yellow, or purplish in drying, 7-9 mm. long, 4-6 mm. wide; disk-corollas 3 mm. long; achenes 



3 mm. long, black, decidedly hairy; pappus yellowish, 4 mm. long. 



Type locality: Guatemala and Costa Rica. 

 Distribution: Southern Mexico to Costa Rica. 



4. GYMNOLAENA (DC.) Rydberg, gen. nov. 



Dyssodia § Gymnolaena DC. Prodr. 5: 641. 1836. 



Branched shrubs or herbs. Leaves opposite, short-petioled or sessile, simple, serrate, 

 of a lanceolate type. Involucre of a single series of 5-9 bracts, united to near the apex and 

 with 2-4 rows of glands, naked or subtended by 1 or 2 small subulate or linear (or in the last 

 species more numerous and lanceolate) accessory bracts. Receptacle alveolate-dentate, 

 pubescent. Ray-flowers pistillate, fertile; ligules oblong to oval, obscurely toothed, from 

 yellow to brick-red. Disk-flowers 25-40; corollas yellow, usually with dark veins; tube about 

 equaling the trumpet-shaped throat; lobes lanceolate. Style-branches slender-appendaged 

 from a truncate subpenicillate tip. Achenes clavate, angled and striate, short-hirsute with 

 ascending hairs. Pappus of 10-15 squamellae, each dissected into 8-12 bristles. 



Type species, Dyssodia serratifolia DC. 



Accessory bracts 1 or 2, linear or subulate, small; shrubs. 

 Leaves ovate-lanceolate. 



Ligules deep-orange or brick-red. 1. G. oaxacana. 



Ligules yellow. 2. G. serratifolia. 



Leaves linear-lanceolate; ligules yellow. 3. G. inlegrifolia. 



Accessory bracts several, lanceolate, somewhat herbaceous; herbs. 4. G. Seleri. 



1. Gymnolaena oaxacana (Greenman) Rydberg. 



Dyssodia serratifolia A. Gray, Proc. Am. Acad. 19: 37, in part. 1883. Not D. serratifolia DC. 



1836.. 

 Dyssodia oaxacana Greenman, Field Mus. Publ. Bot. 2: 273. 1907. 



A branched shrub; branches terete, somewhat striate, minutely pubescent in decurrent 

 lines; leaves sessile or nearly so, lanceolate, 1-4 cm. long, 4-11 mm. wide, acute, 

 finely serrate, slightly pubescent on both sides or glabrous above; heads few; peduncles 3-8 

 cm. long, with several lanceolate or subulate bracts; involucre cylindro-campanulate, 12-14 

 mm. high, with 1 or 2 linear accessory bracts, or naked at the base; bracts 7-8, glabrous, with 

 deltoid, usually somewhat puberulent tips and 2-4 irregular rows of oblong glands; ray- 

 flowers commonly 8; ligules deep-orange or brick-red, 7 mm. long, 4-5 mm. wide; disk- 

 flowers about 30; corollas about 9 mm. long; tube puberulent, equaling the cylindric-trumpet- 



