130 PITTONIA. 
A somewhat local, but very distinct species, known to me 
only from Mt. San Francisco, northern Arizona, where I col- 
lected it in flower, 10 July, 1889. It exists in the U. S- 
Herbarium from the same locality as eollected by Edw. 
Palmer in 1869, and by Mr. MeDougal,7 July, 1899. From 
the date of its flowering in that low latitude it will correctly 
be inferred to be subalpine. Its nearest affinity is the next 
species, and both are related to S. Americana rather than to 
the Pacific coast Sorbus species. 
SORBUS scoputina. Shrub 8 to 12 feet high, not slender; 
the growing branchlets very sparsely villous or hirsutulous: 
leaves 5 to 7 inches long, the rachis glabrous, or somewhat 
pilose at the joints; leaflets in 6 or 7 pairs, glabrous on both 
sides, about 14 inches long, oblong-lanceolate, very acute, 
‘deeply and often doubly serrate from base to apex, the ser- 
ratures rather salient, not at all glandular or callous at tip: 
scales of the winter buds villous on the margin, otherwise 
glabrous: ample cyme more flat-topped; pedicels and base 
of calyx sparingly villous under a lens. 
Mountains of northern New Mexico (Heller’s n. 3711 
from Santa Fé Cafion, 8,000 ft., June, 1897), Colorado (C. F. 
Baker, at 9,000 ft., near Pagosa Peak, 10 Aug., 1899; also 
the same from Four-mile Hill, Routt Co., 8,500 ft., 1896), 
and Utah (L. F. Ward, east of Gunnison, 9,000 ft., 1875; 
and Marcus Jones, at Provo, 8,000 ft., 3 July, 1894). This 
has been referred, usually, to S. sambucifolia, which is a 
native of Kamtschatka; but it has as often been included 
in S. Americana, to which it is more nearly related, indeed ; 
but many characters distinguish it from the typical form of 
that species. I know not how much of the more northerly 
or northwesterly S. sambucifolia, i. e, of Montana and 
Idaho, may be included in S. scopulina. My types are the 
specimens of C. F. Baker and Mr. Heller. 
SORBUS SUBVESTITA. Bark of mature branches dark-red- 
brown, scarcely dotted, of growing ones canescently tomen- 
tulose : leaves 4 to 6 inches long, the leaflets in about 8 pairs, 
