448 BOTANICAL GAZETTE [JUNE 
their dilated bases: the paniculate cyme 8-10™ long, secund : 
petals white, 3™™ long, twice the length of the lanceolate-tri- 
angular sepals : stamens five, or sometimes perhaps abnormally 
seven, with filaments 0.5™™ long. | 
On moist rocks in Black cafion of the Uncompahgre river, 
Colorado, at an elevation of 7200 ft., Dr. C. A. Purpus, no. 512. 
The specimens are young and have no mature fruit. 
Mentzelia leucophylla, n. sp.— Biennial or triennial (?): 
stems several from the root, 3-4’ high, covered with a soft 
white pubescence: radical leaves 6—8°" long and 1™ wide, linear- 
oblong, attenuate to the base and apex, regularly sinuate-den- 
tate, densely covered on both surfaces with short rigid hairs, 
upwardly barbed, those of the margin minutely glochidiate ; 
stem leaves oblong, 4™ long, 1-1.5°™ wide, rounded at the top 
and pointed, cordate-clasping at base especially the upper ones, 
slightly sinuate-dentate, densely hispid, only the marginal hairs 
glochidiate : flowers bright yellow, on pedicels 1-8™™ long, in a 
sparingly divaricately branched panicle: petals broadly spatu- 
late, slightly retuse and pubescent at tip, 1™ long: sepals tri- 
angular acuminate, obtuse, 6™™ long: outer stamens broadly 
petaloid, the blades slightly dentate above: capsule 8-10™ 
long and nearly as broad: seeds flat, margined by a border less 
than 0.5™™ wide. 
Ash Meadows, Nevada, Dr. C. A. Purpus, no. 6032. 
Aplopappus (Srenotus) MacLeanii, n. sp.—Cespitose from a 
multicipital caudex, the woody stems 6—-12™ long, sending down 
rootlets: leaves 2™ long and less than 1" wide, crowded on 
branchlets 2~3™ long, linear-lanceolate with stout midrib and 
ciliate with short stiff hairs: peduncles 2™ long, terminating 
the branchlets, bearing two bracts similar to the leaves and a 
single head about 8™ high and wide: involucral bracts linear- 
lanceolate, minutely glandular-ciliate : rays six to eight, shortly 
lobed at tip, 2 long: disk flowers twenty to twenty- sfive.s 
styles dark margined, with long conical tips: pappus soft and 
= a cet I TR in 
