Part 1, 1914] CARDUACEAE : HEtENIEAE 25 



Heads several (except in one species) in naked corymbs, radiate or discoid. Involucre cam- 

 panulate; bracts rather thin, neither boat-shaped nor surrounding the marginal achenes. 

 Receptacle flat. Ray-flowers, if present, pistillate and fertile; ligules rectangular, oval, or 

 obovate. Disk-flowers comparatively few; tube glandular-puberulent; throat campanulate 

 to nearly cylindric. Achenes flat, not ciliate on the margins. Pappus of 1 or 2 bristles or 

 wanting; crown of squamellae never present. 



Type species, Laphamia halimifolia A. Gray. 



Heads corymbose; corolla-throat campanulate; pappus-awns wanting or soli- 

 tary. 

 Rays present ; leaf-blades rhombic-ovate, dentate. 

 Pappus of a single awn. 



Leaf-blades rounded-ovate or suborbicular, truncate at the base, firm. 1. L. rotundata. 

 Leaf-blades ovate, cuneate at the base, thin. 2. L. Lindheimeri. 



Pappus wanting; leaf -blades ovate-rhombic, with few salient teeth. 3. L. halimifolia. 



Rays wanting; pappus wanting. 



Leaf -blades ovate, laciniate; stems decumbent. 4. L. laciniala. 



Leaf -blades narrowly lanceolate; stems erect, short. 5. L. angustifolia. 



Heads solitary; corolla-throat nearly cylindric; pappus of 2 awns. 6. L. bisetosa. 



1. Laphamia rotundata Rydberg, sp. nov. 



A low perennial with thick woody caudex; stems about 1 dm. high, glandular-puberulent; 



leaves mostly alternate; petioles 5-8 mm. long, glandular-puberulent; blades 5-10 mm. long, 



rounded-ovate or suborbicular, truncate at the base, coarsely dentate, 3-ribbed. rather firm, 



glandular- or scabrous- puberulent and impressed-punctate ; heads corymbose; involucre 



campanulate, 4 mm. high and about as broad; bracts 10-12, linear-oblanceolate, glabrate; 



disk-corollas 3 mm. long; tube shorter than the campanulate-funnelform throat; achenes oblong, 



2 mm. long, sparingly and minutely hispidulous; pappus of a single bristle, nearly equaling the 



corolla. 



Type collected at San Estaban, Texas, September 3, 1852, Bigelow (referred to L. rupestris by 

 Dr. Gray; type in herb. N. Y. Bot. Gard.). 



2. Laphamia Lindheimeri A. Gray, PI. Wright. 1: 101. 1852. 



A perennial with woody caudex; stems erect, 1-2 dm. high, grayish-puberulent ; leaves 



mostly alternate; petioles about 1 cm. long; blades ovate to elliptic, entire or sinuate-dentate, 



minutely puberulent or glabrate, glandular-punctate, 1-2 cm. long, 3-ribbed; heads corymbose; 



involucre 3.5-4 mm. high, 4 mm. broad; bracts 12-14, linear-oblanceolate, ciliate towards 



the apex; ligides obovate, 3 mm. long, 3-toothed; disk-coroUas 2 mm. long, the tube equaling 



the campanulate throat; achenes oblong, 2 mm. long, minutely hispidulous on the margins; 



pappus of a single bristle or rarely wanting. 



Type locality: Banks of Guadalupe River, near New Braunfels, Texas. 

 Distribution: Central Texas. 



3. Laphamia halimifolia A. Gray, PI. Wright. 1: 100. 1852. 

 A perennial with a thick woody caudex; stems 1-2 dm. high, minutely puberulent or 

 glabrate; leaves alternate; petioles about 1 cm. long; leaf -blades rather firm, 1-2.5 cm. long, 

 triple-ribbed, ovate or rhombic, veiny, dentate, with few rather salient teeth, glandular- 

 granuliferous and punctate; heads many in naked corymbs, 18-20-flowered, involucre cam- 

 panulate, 3.5 mm. high, 2.5-3 mm. broad; bracts about 10, linear, glabrous except the ciliate 

 tips; ligules broadly oval, 2 mm. long, slightly 3-toothed; disk-corollas 2.5 mm. long; tube about 

 equaling the campanulate throat; achenes linear-oblanceolate, minutely puberulent, the faces 

 obscurely 2- or 3-nerved, with a slightly callous margin at the apex, but no pappus. 



Type locality: San Pedro River [Texas]. 



Distribution: Western Texas. 



Illustration: A. Gray, PI. Wright. 1: pi. 9, B. 



4. Laphamia laciniata (Terr.) Rydberg, sp. nov. 



Laphamia angustifolia ? laciniata Torr. Bot. Mex. Bound. Surv. 82. 1859. 



A perennial with woody caudex; stems decumbent, diffuse, 3-5 dm. long, grayish-puberu- 

 lent; leaves mostly alternate; petioles about 1 cm. long; blades spatulate or cuneate, with few 



