TWO NEW SPECIES OF PLANTS FROM THE 

 NORTHWESTERN UNITED STATES. 



Jiy L. 1'. Hkndkrson. 



Aster latahensis Henderson, sp.nov. (Section Vulgares.) 



Stem slender, 0.6 to 1.5 meters high, woolly-pubescent and scabrous, foment ulous 

 among the heads, bearing numerous nearly erect branches near or above the middle; 

 leaves lanceolate, entire, rather thick, with margins slightly inclined to berevolute, 

 strigose and very scabrous, especially on the margins; lower even 15 cm. in length, 

 including the long, petiole-like base, by 2.6 cm. in width; upper gradually shorter, 

 sessile on a scarcely narrowed base, some with the base broad and inclined to be 

 decurrent, or at times even slightly cordate; those on the secondary branches small 

 and narrow, gradually passing into the involucral scales; involucre i'rom 6 to 12 mm. 

 high, in the fully developed heads averaging 11 mm., in 3 or 4 moderately unequal 

 rows; its outer scales commonly foliaceons, obtuse, green, and pubescent, the inner 

 gradually narrowed, acute ami with whitened coriaceous bases, some or occasionally 

 all with a narrow hyaline margin; rays 5 or 6 lines long, violet to purple, handsome;; 

 disk-flowers generally a bright purple when fresh, sometimes yellow, with yellowish- 

 w r hite pappus; akenes narrow, flattened, strigose-pubescent, strongly nerved with 4 

 or 5 darker nerves; receptacle deeply alveolate, the teeth of the alveolations some- 

 times terminating in delicate bristles. 



A very handsome; species, common on the prairies or slightly- wooded hills of 

 American Ridge, Latah County, Idaho. (No. 2987.) 

 Angelica roseana Henderson, sp. nov. 1'i.atk XXVI. 



Five-tenths to 0.6 meter high, very stout for its height, glabrous nearly or <|uite 

 up to the involucels, scabrous among the flowers, radical leaves tritcrnate, the ulti- 

 mate divisions frequently pinnate with 3 or 5 leallets, or occasionally ternate- 

 quinate; upper cauline leaves reduced, with large, inllated petioles, the latter, as 

 well as the Inflorescence, scabrous with retrose prickles, which become rounded 

 papilhe among the flowers and on the fruit; leaflets broadly ovate to lanceolate in 

 the lower leaves, in the upper often narrowly lanceolate, thick with prominent 

 veins, lacmate-dentate, with somewhat retrorsely mucrouate teeth, the margin 

 between the teeth scabrous, an inch to an inch and a half long, obtuse or ncute; 

 umbels, commonly 3, all more- or less fertile, without involucre, or involucrate with 

 one or two ligulate generally 3-lobed bracts; the umbellets subtended by a few fili- 

 form and very scabrous bractlets, the rays very unequal; flowers green or the 

 majority of them green at base and purplish brown above; petals strongly incurved; 

 stylopodium somewhat conical; fruit broadly oblong-elliptic, glabrous, save the 

 papilhe, 4 or 5 millimeters long; dorsal ribs nearly as prominent as the lateral, 

 corky, the cut surfaces appearing broadly ovate; oil tubes for the most part single 

 in the intervals, two on the commissural side; seed sulcate beneath the oil tubes, 

 strongly concave on the face. 



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