10 ; Rhodora [JANUARY 
mistaken for var. villosa it is probable that some of the unverified or 
doubtful records of the latter belong to forma subsericea. 
Briefly summarized our interpretation of the American variations 
of Potentilla palustris follows. 
PorENTILLA PALUSTRIS (L.) Scop. Figs. 1 and 2. Branches more 
or less minutely pilose or glandular above, 1-many-flowered: leaflets 
oblong-lanceolate to oblanceolate, acutish to obtuse, green and 
glabrous or merely puberulent above, glaucous and puberulent or 
sericeous beneath: the terminal leaflets of the primary leaves 4-3 as 
broad as long, 2-10 (av. 4.6) em. long, 0.7-3.8 (av. 1.7) em. wide.— 
Fl. Carn. ed. 2, i. 359 (1772). P. Comarum Nestler, Mon. Pot. 36 
(1816). P. rubra Hall. f. in Ser. Mus. Helv. i. 56 (1818). P. digitata 
and angustifolia Raf. Fl. Tell. ii. 55, 56 (1837). Comarum palustre 
L. Sp. Pl. 502 (1753). C. digitatum and angustifolium, Raf. |. c. 55, 
56 (1837). Argentina rubra Lam. Fl. Fr. iii. 120 (1778). Pancovia 
palustris, digitata, and angustifolia Raf. 1. c. 55, 56 (1837).— Cooler 
regions of Eurasia; in North America known from Labrador, Ungava, 
Keewatin, Yukon, and Alaska, southward to Newfoundland, Nova 
Scotia, southern New England, northern New Jersey, eastern and 
northern Pennsylvania, Ohio, northern Indiana, northern Illinois, 
northern Iowa, Wyoming and California— Forma | SUBSERICEA 
(Becker) Wolf, Mon. Pot. 76 (1908); S. F. Blake Ruopora xv. 165 
(1913). Var. subsericea Becker, Deutsch. Bot. Monatsschr. xv. 85 
(1897); Fernald & Wiegand, Ruopona, xii. 111, 140 (1910). Leaflets 
densely sericeous upon both surfaces. Apparently a form developed 
in exsiccated habitats or toward the end of the summer. 
Var. parvifolia (Raf.) n. comb. Fig. 3. Similar, but smaller: 
branches 1-4-flowered: leaflets elliptic to cuneate-obovate, subtrun- 
cate or rounded at tip; the terminal -4 as broad as long, 1.3-4.5 (av. 
2.7) cm. long, 0.9-2.5 (av. 1.5) em. broad.— Comarum angustifolium, 
var. parvifolium Raf. Aut. Bot. 170 (1840).— Labrador, Alaska, and 
islands of Bering Sea; examined from the following stations. LABRA- 
DOR: Ramah, A. Stecker, no. 323; Okkak, Fratres Moravi; Nain, 
. Lundberg; Hopedale (large-leaved transitional plant), Sornborger, 
no. 131; Rigoulette, Bowdoin College Expedition, no. 270; Spear 
Harbor, C. W. Townsend, no. 44. ArasKa: Cape Nome, F.. E. 
Blaisdell; Anvik, J. W. Chapman, no. 4; St. Paul Island, J. M. 
Macoun, no. 71; Dutch Harbor, Unalaska, E. C. Van Dyke, no. 93. 
COMMANDER IsLANDs: Bering Island, Stejneger, no. 27. 
Var. viLLOSA (Pers.) Lehm. Fig. 4. Often coarser: branches 
few- many-flowered, with the petioles, peduncles, bractlets, etc. 
densely glandular-villous: leaflets villous or densely sericeous, oblong- 
elliptic to narrowly obovate, rounded at tip, 3-2 as broad as long; 
the terminal 3.3-9.4 (av. 5.6) cm. long, 1.4-3.1 (av. 2.2) em. broad.— 
Stirp. Pug. ix. 44 (1851) and Revis. Pot. 74 (1856); Walp. Ann. ii. 
483 (1851-52); Wolf, Mon. Pot. 76 (1908); Robinson & Fernald, 
