OF ARTS AND SCIENCES. 279 



C. G. Pringle (n. 1293), Oct., 1887. In the character of the pappus 

 this species approaches Bahia still more nearly than does H. Palmeri. 



Tagetes Pringlei. Annual, erect and branching, 2 feet high or 

 more, glabrous : leaves simple, linear, serrate, ciliate toward the base, 

 2 or 3 inches long : heads few in the open cymes ; involucres some- 

 what turgid, contracted and punctate above, with 5 blunt or apiculate 

 teeth : flowers included, the 2 yellow rays scarcely exceeding the in- 

 volucre : achenes linear, scarcely scabrous on the angles ; awns 2 or 3, 

 equalling the corolla or one shorter, the 2 or 3 palea? short and blunt. 

 — In wet places on the pine plains at base of the Sierra Madre, 

 Chihuahua; C. G. Pringle (n. 1297), Sept., 1887. Allied to T. 

 lucida. 



Pectis aquatica. Growing in shallow water, the floating stems 

 a foot long, sparingly leafy and branched at top, glabrous and spar- 

 ingly punctate : leaves linear, entire, not setose, an inch long : heads 

 few and sessile or nearly so ; involucre 3 to 5 lines long, of 5 imbri- 

 cate obtuse purple-tipped bracts : flowers (about 12) included or nearly 

 so ; rays none : achenes very slender, with long-attenuate base, 3 or 4 

 lines long; pappus of 10 or 12 unequal scabrous bristles, the longest 

 shorter than the corolla. — On pine plains at the base of the Sierra 

 Madre, Chihuahua ; C. G. Pringle (n. 1296), Sept., 1887. A true 

 Pectis, but of peculiar habit and the leaves wanting the usual ciliate 

 bristles. 



Artemisia dracunculina. Closely resembling A. Dracunculus 

 and A. dracunculoides : stem and leaves more or less villous with 

 soft spreading hairs : leaves linear, entire or the cauline 3-cleft, 1 to 

 2| inches long: panicle very loose, the heads (mostly ascending) on 

 filiform peduncles 2 to 4 lines long ; involucre nearly glabrous : sterile 

 flowers numerous, the styles long-exserted. — At the base of cliffs in 

 the Sierra Madre, Chihuahua; C. G. Pringle (n. 1309), Oct., 1887. 

 The whole plant, and especially the roots, have a decided odor. 



Senecio umbraculifera. Densely and closely white-tomentose 

 throughout, perennial, the stems erect from a horizontal rootstock, 1| 

 feet high : basal leaves linear-oblanceolate or linear, acute or acutish, 

 attenuate to a short petiole, entire, 3 to 7 inches long, the cauline 

 scarcely shorter, few (3 or 4), linear-lanceolate, sessile : heads approx- 

 imate in a close cymose panicle, rather small, radiate ; involucre nar- 

 rowly campanulate, the bracts (10) 3 or 4 lines long: rays 5 or 6 : 

 achenes canescent. — Summits of the Sierra Madre, Chihuahua, at 

 9,700 feet altitude; C. G. Pringle (n. 1316), Oct., 1887. Near 

 S. fastigiatus. 



