1912] NELSON— IDAHO PLANTS 4°9 



carpels are 5 (the more unusual number); anthers pink: fruit 

 black or purplish-black, maturing in July: carpels with rounded 

 back, cuneately narrowed to the somewhat sulcate ventral angle, 

 not narrowed at base. 



This may be thought too near C. Douglasii LindL, but authors are fairly 

 well agreed that that species should have the following characters, to none of 

 which this seems to attain: 



Tree size (30-40 feet high, with trunk sometimes as much as 20 inches in 

 diameter): leaves ovate to obovate, with cuneate base, densely pubescent 

 above, on the veins below, and on the petioles when young: calyx lobes decidu- 

 ous, glandular serrate: stamens 20 (Sargent), 10-20 (Brixton, Robinson, 

 and Fernald, et al.) : anthers yellow: styles surrounded at the base with long 

 pale hairs: fruit ripening in August and September: carpels narrowed at base. 



In view of the differences indicated it would seem that at least some of the 



f 



western forms that have heretofore passed as C. Douglasii need to be separated 

 from it. 



The type is Macbride's no. 799 (flowers, May 10; ripe fruit, from naked 



tree, July 8), moist woods, Falk's Store, Canyon County. 



Trifolium tropicum, n. sp. — Apparently green and glabrous 

 but under a lens pubescent with scattering white hairs, especially 

 near the midrib both above and below: stems single, from slender 

 roots tocks, erect, slender, 2-3 dm. high: leaflets linear, 3-6 cm. 

 long, 2-5 mm. wide, minutely denticulate by the projection of the 

 beautifully arcuate nerves; petioles slender, from much shorter 

 to much longer than the leaflets; stipules linear, the free portion 

 usually denticulate, 14-18 mm. long, either shorter or longer than 

 the adnate portions: heads about 2 cm. high, nearly as broad, 

 solitary or 1 or 2 smaller ones from the upper leaf-axils, in bud 

 silvery-silky with the long abundant hairs on the filiform calyx 

 lobes: flowers purple to rose-red, soon reflexed and nearly con- 

 cealing the pubescence of the calyx: calyx lobes longer than the 

 thin scarious glabra te tube : standard oblong, with rounded apicu- 

 late apex, about 10 mm. long and 4 mm, broad when spread out 

 flat; wings as long as the standard, the blade narrowly oblong, 

 conspicuously auricled at base, as long as the slender claw; keel 

 petals semi-oval, shorter than the wings, the claw longer than the 

 blade: style a little longer than the stamens : ovary glabrous, about 

 8-ovuled. 



