— 53 — 



§ Stem usually simple. Upper leaves widened close to the 

 base: cordate, ear-shapped rarely rounded, basal ones 

 from linear-lanceolate to orbicular. Secondary transverse 

 parallel nerves wanting or obscure: axidrome branched 

 secondary nerves only distincte. Bractlets very broad: 

 obovate or orbicular, obtuse, each with 5 — со nervs, 

 longer than the flowering umbelluls. Fruits with acute 

 or winged ribs. 



-j- From 5 to 20 cm. high. Leaves with a very pro- 

 minent nervation; marginal nerves thik. Cauline leaves 

 1—3 ovate broader at the base short obtuse, upper 

 ones with 5 — 15 thik nerves. Rays 2 — 3 (rarely 4 — 7) 

 very thik, short: 0,5 — 2,5 cm. Bractlets 6—12 

 yellow (or purplish), Pedicels very short and thik. 

 Styles filiform elongated . . . . B. iriradiatum. 



Л Caespitose, stems ascending or prostrate. Basal 

 leaves ovate to orbicular, mostly prostrate. 

 B. triradiatum humilius. 



Л Л Not caespitose, stems trict. Basal leaves lan- 

 ceolate, upright. 



1—1 Basal leaves about as long as stems (with 

 umbels), elongated, acuminate, with very 

 long narrow 'petioles. Bractlets yellow 

 obovate much longer than umbelluls. . . 

 B. triradiatum arcticum. 



1 — 1 1 — I Basal leaves much shorter than stems, 

 obtuse or acutate, with short broad 

 petioles. 



— Tall, to 25 high. Cauline leaves broad. 

 Bractlets very broad mostly orbi- 

 cular, bright yellow 



. . , . Б. triradiatum Adamsii, 



CO Stems with leaves. ...... • 



B. triradiatum Adamsii normale. 



CO CO Stems more or less scapiform. . . 

 B. triradiatum Adamsii alpinum. 



