266 — — PITTONIA. 
glabrate except at base, and nearly impunctate at all stages. 
Species still rare in collections, but most distinct; wholly of 
the Rocky Mountain region, like the one preceding. 
4. T. DEPRESSA. Actinella depressa, Torr. & Gray, Pl. Fendl. 
100 (1849). A peculiar pulvinate-ezspitose plant still little 
known, aüd from western Colorado or adjacent Utah. 
5. T. BREVIFOLIA. Densely matted on the surface of the 
ground (the caudex not, asin the last, mainly subterranean); 
leaves crowded and imbricated on both floriferous and sterile 
branches, the whole leaf only 1 to $ inch long, the oblance- 
olate subulate-cuspidate blade no longer than the equally 
broad scarious base: slender scapes 4 inch high: bracts of. 
the small involucre few, ovate-lanceolate, acutish, densely 
silky-villous, as is also the upper face of the minutely but 
closely puncticulate leaves: rays few and small, or wanting. 
Summit of a bleak ridge above timber line, on Pike’s 
Peak; collected only by Mr. Canby. 
6. T. ARIzoNICA. Size and habit of the common T. acaulis, . 
but less ligneous-esespitose, the oblanceolate acute leaves 
loosely villous-hirsute or silky and strongly punctate, of 
comparatively thin texture, the base scarious and very hir- 
sute at the insertion: bracts of the involuere oval or oblong- 
ovate, obtuse: pales of the pappus obtuse but abruptly 
pointed with a subulate long awn. 
Treadwell, Arizona, Edw. Palmer, 1877 (n. 259); also at 
Peach Springs, Rusby, 1883, the latter more silky than those 
by Dr. Palmer. 
7. T. SCAPOSA. dela brs scaposa, DC. Prodr. v. 668 
(1836). Actinella scaposa, Nutt. 1. c. Whole plant very vil- 
lous: lowest leaves very broadly, the others narrowly lan- 
ceolate, acute, entire or pinnatifid with acute not deep lobes, 
the punctuation of the leafsurface sparse, obscured by the 
silky indument: involucre densely villous-tomentose. 
