CONTRIBUTIONS FROM THE ROCKY MOUNTAIN 
HERBARIUM. XIII 
AVEN NELSON 
[In this paper are brought together a number of interesting species repre- 
senting various localities. Among the hundreds of specimens submitted to the 
Rocky Mountain Herbarium each year for verification or identification, a 
few real novelties invariably appear. The writer wishes to express his appre- 
ciation of the fact that many well known botanists, as well as amateurs, 
cordially permit him to share with them the pleasure of studying their col- 
lections, in whole or in part. The names of those who are represented in this 
paper occur in the notes on the species described. I want to call attention 
to the fact that two genera, new to Colorado, are included in the list below.] 
Brodiaea Paysonii, n. sp.—The membranes sheathing the corms 
brown and very fibrous, the inner ones prolonged into scarious 
sheaths 4-8 cm. long and enclosing the base of the glabrous green 
scapes and leaves: scapes 15-25 cm. high: leaves narrowly linear, 
at least a half longer than the scapes, rather lax and spreading: 
umbel few-flowered, the pedicels 10-15 mm. long: bracts ovate- 
lanceolate, acute, scarious and somewhat petaloid, green-nerved, 
shorter than fully developed pedicels: perianth white, shading 
to faint rose-color, 15-20 mm. long; the oblong obtuse segments 
a little longer than the tube, delicate in texture with a rather strong 
purplish-green mid-nerve terminating in a blunt hoodlike tooth — 
at apex: stamens 6, in one row, united to each other and to the 
perianth segments by a delicate transparent membrane: anthers 
large, 5~6 mm. long: ovary ovate-oblong, about 6 ovules in each 
cell: mature seeds black, very large and thin, 7-8 mm. broad, the 
body of the seed less than half as wide as the black membranous 
epicarp. 
Named in honor of Epwin E. Payson, the collector, an enthusiastic 
student of the Colorado flora in the Montrose High School, class of 1913. He 
Teports this plant abundant on the dry adobe soils, blossoming so early that 
“by the last of June there is nothing showing above ground except the scape 
bearing the large triangular dehiscent capsule.” Payson’s no. 33, Montrose, 
May 18, r912, is the type. 
63] (Botanical Gazette, vol. 56 
