142 PROCEEDINGS OP THE AMERICAN ACADEMY 



Dahlia pubescens. Stem erect from a cluster of small tubers, 

 1^ to 3 feet liigb, leafy, more or less pubescent witb mostly sbort stiff 

 pointed bairs : leaves pinnate, 3 to 4 incbes long, tbe 5 to 7 leaflets (an 

 incb long) ovate to lanceolate, coarsely and acutely tootbed: heads erect 

 on loug peduncles, coarsely pubescent at base, tbe outer scales ovate- 

 lanceolate, acutisb, 4 or 5 lines long, the inner lanceolate, 9 lines long 

 in fruit; rays purple, 12 to 15 lines long: acbenes nearly as iu tbe 

 last, but usually shorter (3 lines long) and broader. — On limestone 

 bluffs at Flor de Maria, State of Mexico; August, 1890 (n. 3164). 



BiDENS DAHLioiDES. Low and slender, glabrous, bearing tubers 

 alonw tbe slender branches of a divided rootstock : lower or lowermost 

 leaves entire, lanceolate or oblanceolate, acute, attenuate to the peti- 

 ole ; the upi)er (3 inches long) pinnately 3-5-lobed, tbe terminal seg- 

 ment broadly ovate to lanceolate, less deeply 3-lobed, the lateral 

 ovate-lanceolate, entire : heads solitary upon elongated terminal pe- 

 duncles, the purplish ray 1^ inches long : scales of the two involucres 

 similar and nearly equal, many-nerved, 6 lines long : acbenes oblan- 

 ceolate, 5 lines long, flattened, with iw^o short stout retrorsely bearded 

 awns at the angles. — Dahlia-like in habit, but with the awned acbenes 

 and short-appendaged style-branches of Bidens. On hillsides at Flor 

 de Maria, State of Mesico ; Sept., 1890 (n. 3168). 



Bahia Schaffneui. Annual, branching from the base, more or 

 less decumbent or procumbent and strigulose-puberulent: leaves sub- 

 ternately decompound, the segments linear and usually short : heads 

 about 3 lines high, the involucre of 8 to 10 broadly oblanceolate ob- 

 tuse or acutisb bracts : ligules deep yellow, short : acbenes very nar- 

 rowly obpyramidal, somewhat hispid on the angles, especially near 

 the base, 1^ lines long or more; pappus of five obovate imbricate 

 scales, about |- line long, nearly equalling the slender corolla-tube. — 

 Sandy plains near San Luis Potosi ; May, 1889 (n. 3028), Also col- 

 lected by Dr. Schaffner (n. 327, in part) in the same locality, and by 

 Parry & Palmer (n. 494), referred to Ji. anthemoidcs. It is the same, 

 moreover, as a plant cultivated from Mexican seeds in the Jardin des 

 Plantes iu 1838 and 1839, of which there are s])ecimens in Herb. 

 Gray. B. anihemoides, Gray, with which the species has been con- 

 fused, is represented in Herb. Gray by specimens collected at Toluca 

 by Berlandier, and by 327 Schafl'ner (in part), probably from the 

 valley of Mexico ; it is also 3143 Pringle, collected near the city of 

 Mexico. As described and figured in HBK. Nov. Gen. & Spec, it is 

 characterized by white ligules and by a much shorter and broader and 

 more pubescent achene. 



