Mex., Sept. 19. 1903. 



Aster Madrcnsis n. sp. 



Closely resembling A. Lcmmoni, but annual, erect, slen- 

 der, sparingly branched and corymbosely so; heads on slender 

 bracteate peduncles about 1 inch long; root leaves oblanceo- 

 lite, 1-2 inches long. 3-4 lines wide, tapering into a short and 

 winged petiole, minutely serrulate, stem leaves narrower, 

 mostly linear and acute, reduced to green and subulate bracts 

 r.bove; heads single, about 4 lines long and wide, with well 

 imbricated linear and acute bracts with green centers and 

 hvaline margins ; rays many, very short, purplish, narrow : 

 flowers many; pappus of simple and copious hairs which are 

 capillary and not enlarged above; seeds about 1 line long, nar- 

 rowly oblong, very evidently 5-nerved, puberulent, inclined to 

 be beaked ; stems usually a foot long. A similar plant col- 

 lected on the Santa Cruz bottoms, Tucson, has narrow leaves 

 and is .3 feet tall and very much branched above, with shorter 

 peduncles and many bracts ; seeds narrower. This may have 

 been included by Gray in his A. hesperius. Also collected by 

 me at Colonia Juarez, Chihuahua, Mex. The type is from 

 San Dieeo Canon west of Juarez along streams in wet places, 

 Sept., 1903, 6400 feet alt., in the Middle Temperate Life Zone. 



Eupatorium arborescens n, sp. 



Shrub 4-6 feet high, with tufted branches of the season 

 toward the ends of the stems, stems slender and with flaky 

 bark, and thin, erect in large tufts; glabrous leaves opposite, 

 2-4 inches long, thin, ovate-lanceolate and long-acuminate, 

 serratures fine'and about 1-2 lines apart, nerves 3-5 near the 

 base, base truncate to nearly cordate, one side running down 

 on the petiole a little; petioles about 3-6 lines long, stout; 

 leaves narrowed and shorter toward the inflorescence and re- 

 duced to subulate bracts in the upper part of the thyrsus, not 

 reduced on the lower pair of floral branches ; inflorescence 

 thyrsoid, 4-6 inches long, branches of thyrsus filiform, the 

 lower about 1 inch long to the first cluster and clusters on 

 filiform pedicels 2-4 lines long; glomerules of 2-5 heads which 

 are nearly sessile; heads 3 lines long, including the styles; 

 bracts about 8, linear, very acute, 1-2 outer ones shorter, 

 3-nerved, puberulent (pedicels and peduncles mmutely 

 woolly) ; flowers 4-6. very narrow, with deltoid and thick 

 lobes, very resinous-dotted and purplish; style branches 

 cxserted fully 1 line long; akenes tapering, very pubescent. 



