[Vol. 8 
194 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
of specimens characterized by glabrous, nearly globose pods, 
conspicuously sigmoid pedicels, and an imperfect rosette. As to 
size of the pods, form of the basal leaves, and leafiness of the 
stem there is considerable variation. The series of specimens 
at hand is scarcely enough to show whether or not the species 
should be broken up into two or three varieties, and accordingly 
the present treatment is regarded as rather provisional. The 
type is characterized by small pods and numerous stem-leaves. 
30. L. pruinosa Greene, Pittonia 4: 307. 1901. 
Perennial, canescently stellate-pubescent throughout, stellae 
small, scarcely contiguous on fully 
developed leaves, many-rayed, rays 
forked, irregularly coherent; caudex 
woody, sometimes branched; stems 
decumbent or erect, 10-17 cm. long, 
unbranched; terminal bud remain- 
ing undeveloped; radical leaves 3-8 
em. long, blade indefinitely quadrate 
to oval, entire or repand, obtuse, 
abruptly narrowed to the slender peti- 
ole which exceeds it in length, peti- 
ole frequently purplish, pruinose with 
not closely contiguous stellae; cau- 
line leaves obovate, entire or few- 
Vig 2l L. midea Habit toothed, obtuse, 1-2 cm. long; flowers 
sketch x 14. Trichomes x 25. —Sulphur-yellow, small; fruiting inflo- 
rescence elongated, rather crowded; 
pedicels conspicuously sigmoid, 5-6 mm. long; pods erect, ses- 
sile or subsessile, glabrous, ellipsoid, 6-9 mm. long; styles slen- 
der, 4-6 mm. long; septum nerved, entire, areolae conspicuously 
tortuous; ovules 3-4 in each cell, funiculi attached to the sep- 
tum for less than one-half their lengths; seeds not margined. 
Distribution: southern Colorado. 
Specimens examined: 
Colorado: Pagosa Springs, Archuleta County, July 4, 1917, 
Bethel (Geo. Osterhout Herb. and Bethel Herb.). 
This species is most closely related to L. pinetorum and marks 
a decided advance in specialization as well as a considerable 
