Bupleurum americanum Coult. & Rose

Bupleurum americanum Coult. & Rose, Rev. N. Am Umbell. 115. 1888.
Bupleurum angulosum sensu Cham. & Schlecht. Linnaea 1 : 383, in part. 1826. Not B. angulosum L.
1753. Bupleurum angulosum sensu H. & A. Bot. Beech. Voy. 124. 1832. Not B. angulosum L. 1753. Bupleurum ranunculoides sensu Hook. Fl. Bor. Am. 1: 263. 1832. Not B. ranunculoides L. 1753. ? Bupleurum ranunculoides var. arcticum Regel in Regel & Tiling, Fl. Ajan. 97. 1858. ? Bupleurum ranunculoides var. triradiatum f. arcticum H. Wolff in Engler, Ptlanzenreich 43 (4 228 ) :
117. 1910. Bupleurum pur pur cum Blankinship, Mont. Agr. Coll. Stud. 1: 89. 1905. Buplenrum triradiatum var. ajanense K.-Pol. Acta Hort. Petrop. 30: 200, as to American plants.
1915. ? Bupleurum triradiatum var. humilius Rupr ; K.-Pol. Acta Hort. Petrop. 30: 200. 1915. ? Bupleurum triradiatum var. arcticum K.-Pol Acta Hort. Petrop. 30: 200. 1915.
Perennial and often cespitose, 2-40 cm. high, green and glabrous throughout; leaves linear to oblong-lanceolate, 2-16 cm. long, 3-8 mm. broad, acute, tapering at the base but sessile or nearly so, clustered at the base; cauline leaves few or none, lanceolate, more or less auriculate; peduncles 2-10 cm. long; involucre of 2-6 ovate to lanceolate, acute, foliaceous bracts, 5-15 mm. long, 3-7 mm. broad; involucel of 6-8 oblanceolate to ovate, acute bractlets, 3-5 mm. long, 1-3 mm. broad, united at the base, shorter than the flowers and fruit; rays 4-14, spreadingascending, unequal, 5-35 mm. long; pedicels 1-3 mm. long; flowers yellow or purplish; fruit oblong, 3-4 mm. long, 2-2.5 mm. broad, smooth, the ribs filiform, evident; oil-tubes numerous about the seed and I in each rib; seed-face plane.
Type locality: Alaska, Lay b" Collie.
Distribution: Yukon Territory and Alaska, south to northern Wyoming and Montana (_Mexia 2258, Payson if Payson 2682, 3014).

Bupleurum americanum là một loài thực vật có hoa trong họ Hoa tán. Loài này được J.M.Coult. & Rose mô tả khoa học đầu tiên năm 1888.