MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 193 
Intustrations: Hook. Fl. Bor. Am. 1: pl. 63; Lindl. Bot. Reg. 16: pl. 1379; Britt. 
& Brown, Ill. Fl. 2: f. 1913. Pare 102, f. 1, 2; dissection of flower, f. 3; pistil, f 4; 
stamen, f. 5; fruiting hypanthium and calyx, f. 6. 
Stem stout and erect, 3-10 dm. high, striate, generally densely glandular or viscid, 
hirsute with spreading hairs, generally simple below, branched above, with very short 
nearly upright branches. Lower stipules ovate-lanceolate, submembranous and sub- 
entire, the upper broadly ovate and coarsely dentate or entire. Basal leaves many, with 
petioles 5-20 cm. long, pinnate; leaflets 8-5 pairs, strongly veined, densely pubescent on 
both sides with appressed hairs, or those on the veins spreading. Upper three leaflets 
larger than the others, 2-10 em. long, generally 4-5 em., doubly serrate, the odd one gener- 
ally rhomboid, the others usually obliquely ovate; the lower pairs gradually diminishing 
downward. Stem leaves similar but smaller, with short petioles and fewer leaflets. Flowers 
in a crowded dense, strict cyme, 12-18 mm. in diameter. Hypanthium glandular viscid, 
in fruit enlarged. Bractlets lanceolate, much smaller than the oblong-ovate acute or mu- 
cronate sepals. Petals broadly obovate or nearly orbicular, white or ochroleucous, in dry- 
ing turning yellow, a little longer than the sepals. Stamens 25-30, most commonly 30; 
anthers flat, slightly cordate at the base. Pistils numerous; achenes smooth; style basal 
or nearly so, fusiform. 
This is the only eastern species of the genus, extending from New Brunswick to the 
District of Columbia, westward to the foothills of the Rocky Mountains, from Colorado, 
as far north as Fort Simpson, on the Mackenzie River. It differs from the others by its 
pubescence, which is coarser, densely hirsute and glandular, and by its dense and strict 
eyme. Dr. Watson observes that in the Rocky Mountain region there is found a form 
of P. arguta with bright yellow flowers. This is probably a mistake, and the specimens 
referred to belong to D. glutinosa. 
The variety ferruginea described by Lehmann I can but regard as a large form of the 
species. The plant very commonly takes on a brownish or ferruginous hue in age. The 
Potentilla ferruginea of Paxton’s Magazine,' cited by Lehmann, has nothing to do with 
this speces; it is a true Potentilla, a hybrid of the purple-flowered P. atrosanguinea with 
the yellow P. pedata. 
2. Drymocallis convallaria. 
Potentilla convallaria Rydberg, Bull. Torr. Bot. Club, 24 : 249. 1897. 
Intustrations: Bull. Torr. Bot. Club, 24: pl. 306. PLATE 104. 
Stem tall, erect, 4-10 dm. high, long-villous but not very densely so, glandular or 
viscid, especially above, branched above with long erect branches. Stipules ovate or 
U5: 238: 1838: 
