182 Rhodora [OCTOBER 
formly developed, those on the upper surface of the median cauline 
leaves being 3-5 mm. long. 
In their extremes these four variants appear so different that they 
might, to some botanists, seem to be distinct species; but in the essen- 
tial characters of the inflorescence, including the involucre and achenes, 
they appear inseparable, and their differential characteristics are 
merely somewhat localized recombinations of a series of variable ten- 
dencies of the pubescence. As geographic varieties, however, they 
are very definite and we propose those heretofore unnamed as 
HIERACUM SCABRUM Michx., var. leucocaule, n. var., humile 1-2.5 
dm. altum multis cum foliis; caule prope apicem et saepius per totam 
longitudinem cum tomento denso et albo tecto et cum glandulis atris 
stipitatisque instructo; foliis 15-25 coarctatis oblongis vel elliptico- 
obovatis, superioribus gradatim minoribus, foliis mediis caulinis 2-5 em. 
longis, utrinque brevissime glanduloso-pilosis infra costa hispidis cum 
pilis 0.5 mm. longis vel saepe brevioribus quibus cum glandulis stipi- 
tatis mixtis. l 
Low, 1-2.5 dm. high, very leafy: stem invested toward the sum- 
mit and more often throughout with dense white tomentum mixed 
with dark stipitate glands: leaves 15-25, crowded, oblong or elliptic- 
obovate, gradually diminishing upward, the median cauline ones 2-5 
cm. long, both surfaces minutely glandular pilose, the midrib hispid 
beneath with hairs 0.5 mm. or less in length intermixed with stipitate 
glands.— Nova Scorra: Sable Island, September, 1911, H. T. Gussow, 
Empetrum heaths and sand dunes, September 6 and 11, 1913, St. John, 
nos. 1357 & 1358 (TYPE in Gray Herbarium). 
H. scABRUM Michx., var. tonsum, n. var., quam forma typica, gra- 
cilius 3-5 dm. altum subscaposum vel cum foliis paucis instructum; 
caule infra glabrescente vel pilis 0.2-0.6 mm. longis saepe paulum 
glandulosis hispidulo, caulibus apice ramisque inflorescentiae albido- 
tomentosis cum glandulis nigris stipitatis valde tectis; foliis plerumque 
radicalibus, caulinis 4-11 parvis remotis, utrinque glabris vel paulo 
brevi-setulosis, costis infra marginibusque cum trichomis vix 0.5 mm. 
longis hispidis saepe cum glandulis sparsis permixtis. 
Rather slender, 3-5 dm. high sparingly leafy or sub-scapose: stem 
glabrescent or hispidulous below with hairs 0.2-0.6 mm. long, and often 
slightly glandular; summit of the stem and branches of the inflores- 
cence white-tomentose and heavily invested with black stipitate 
glands: leaves mostly basal, the cauline 4-11, remote and small; both 
surfaces glabrous or sparingly short setulose, the midribs (beneath) and 
margins hispid with trichomes barely 0.5 mm. long, often mingled with 
scattered glands.— QuEnEc: dry clearings, southwest of Etang du 
Nord, Magdalen Islands, August 22, 1912, Fernald, Long & St. John, 
no. 8291 (TYPE in Gray Herbarium); recent clearing, Douglastown, 
Gaspé County, August 21 and 22, 1904, Collins, Fernald & Pease; 
