RYDBERG: Rocky MOUNTAIN FLORA 463 
» Arnica caudata Rydb. sp. nov. 
Perennial, with a short cespitose rootstock; stems 2-3 dm. 
high, leafy, villous, and densely glandular-puberulent; leaves 
nearly erect, linear-lanceolate, mostly sheathing at the base, 
densely glandular-puberulent and with scattered villous hairs, 
5-10 cm. long, 5-8 mm. broad, caudate-attenuate at the apex, 
with entire, somewhat revolute margins; heads mostly 3, cymose, 
with the lateral peduncles usually exceeding the terminal one; 
involucres turbinate, about 1 cm. high, glandular-puberulent 
and hirsute; bracts linear-lanceolate, almost subulate, atten- 
uate; ligules nearly 1 cm. long, I-1.5 mm. broad, deeply toothed 
or cleft; achenes slender, cylindric, glandular-granuliferous, and 
sparingly hispidulous; pappus short, sordid, plumose; corollas 
more or less pubescent. 
This species is perhaps related to Arnica longifolia but is 
easily distinguished by the low habit, the caudate-attenuate leaves, 
and the hirsute as well as glandular-puberulent bracts. 
Urtan: Big Cottonwood Cafion, near Lake Catherine, Aug. 3, 
1905, alt. 9300 ft., A. O. Garrett 1547 (type, in herb. N. Y. Bot. 
Gard.). 
SENECIO 
The original Senecio Bigelovit was collected by Bigelow on 
the Whipple Expedition and a specimen is in the herbarium of 
Columbia University. It differs from all that have been known — 
under that name in later years by the lower leaves having long 
petioles and ovate-lanceolate blades. The petioles are longer than 
the blades, and the latter are abruptly contracted below. In S. 
chloranthus Greene and SS. contristatus Greene the basal leaves have 
comparatively short petioles, and the blades taper gradually 
below. These two species, which it may be, should be united 
in one, are therefore fully as distinct from 5S. Bigelovii as is S. 
scopulinus Greene. The latter is acknowledged as a variety in 
Coulter & Nelson’s New Manual under the name S. Bigelovit 
Hallii A. Gray. It is in reality much closer to S. chloranthus than 
either is to S. Bigelovii. Dr. Greene* in proposing S. scopulinus 
says: “True Bigelovii is still unknown except from southern New 
Mexico, and is of very different aspect, with thin and not at all 
succulent deep-green herbage, usually no trace of any pubescence, 
*Pittonia 4: 117-118. 
