Rydberg : Rocky Mountain flora 1<>3 



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 I cm. high, glandular-puberulent 

 and hirsute; bracts linear-lanceolate, almost subulate, atten- 

 uate; ligules nearly I cm. long, 1-1.5 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. 



Utah: Big Cottonwood Canon, near Lake Catherine, Aug. 3, 



1905, alt. 9300 ft., A. 0. Garrett 1547 (type, in herb. N. Y. Bot. 



Card.). 



Senecio 



The original Senecio Bigelovii 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 5. 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 S. Bigelovii as is S. 

 scopulinus Greene. The latter is acknowledged as a variety in 

 Coulter & Nelson's New Manual under the name S. Bigelovii 

 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. 



