118 Rhodora [JUNE 
which occur in Quebec side-by-side with the commoner discoid form 
of S. indecorus are quite inseparable from the type from Idaho and 
other authentic specimens from British Columbia of S. Burkei Green- 
man, Ott. Nat. xxv. 114 (1911) and Ann. Mo. Bot. Gard. ii. 626, t. 
20, fig. 1 (1915); and it is significant that many of the British Colum- 
bian localities for discoid S. indecorus are identical with those cited 
by Greenman for S. Burkei. 
In the development of its foliage S. indecorus varies as much as 
S. pauciflorus, S. aureus, S. pauperculus and S. resedifolius, the plants 
showing quick responses to degrees of moisture, exposure and soil- 
fertility. In different habitats of the same region may be collected 
specimens with greatly reduced cauline leaves and others with them 
remarkably dilated. Plants of the latter extreme from Rimouski 
County, Quebec, are quite inseparable from S. idahoensis Rydberg, 
Bull. Torr. Bot. Cl. xxvii. 183, t. 6, fig. 5 (1900), which Greenman 
recognizes as a species distinct from S. pauciflorus. S. idahoensis 
has all the technical characters of S. indecorus,—membranaceous 
basal leaves, laccrate-pinnatifid cauline ones, tall stature, numerous 
heads, slender green involucre, characteristic corolla and achene, 
and the alveolate receptacle—and the type-number is, except for 
lack of ligules, a good match for the type of S. Burkei. None of the 
characters of disk-corolla, achene and receptacle are mentioned by 
those who maintain the distinctness of S. idahoensis; but the plant is 
considered remarkable in having the "stem branched from near the 
base" and "large broad stem-leaves" (Greenman, Ann. Mo. Bot. 
Gard. iii. 96). The foliage of the type-number, Sandberg, MacDougal 
& Heller, no. 803, is, as already implied, closely matched by that of 
luxuriant individuals from eastern Quebec and by the type of S. 
Burkei; but, as shown by the sheet of the type-number of S. idahoensis 
in the Gray Herbarium (one of the sheets cited by Greenman), the 
basal branching of this Idaho specimen is due to the fact that the 
primary stem had been broken or bitten off, causing the development 
of few-headed basal branches. 
The type of Senecio discoideus is Hooker's S. aureus, š discoideus 
from Fort Franklin in Mackenzie. An excellent photograph of 
Hooker's type is preserved at the Field Museum of Natural History 
and I am under obligation to Messrs. D. C. Davies and J. Francis 
Macbride for an opportunity to examine it. It is certainly not the 
plant (S. indecorus) which has been passing as S. discoideus in eastern 
