446 ROSACEA. POTENTILLA 



Hills and dry hanks of streams, Canada ! (from lat. 65°, Richardson) to 

 Pennsylvania ! Illinois ! Missouri ! and west to the Rocky Mountains in lat. 

 42°, Dr. James ; June-July. Stem mostly simple 1-2 and often 3-4 feet 

 high, stout, clothed with a soft brownish pubescence, which is glutinous wlien 

 young. Flowers aggregated in usually dense clusters at the extremity of the 

 dichotomous branches of the cyme ; the alar flowers on rather slender pedicels. 

 — The petals are white or ochroleucous, not yellow as is sometimes stated. 

 The figure of Hooker is excellent, except tiiat it does not well represent the 

 disk of our plant. It better represents that of the very nearly allied P. 

 glandulosa, to which the Oregon plant cited in that work belongs. This spe- 

 cies varies greatly in size. 



34. P. fissa (Nutt. ! mss.) : " viseidly pubescent ; stem erect, branching, 

 leafy; leaves pinnately 9-11-foliolate, on short petioles; leaflets unequal, 

 roundish or oval, deeply incised or incisely toothed, the teeth entire ; stipules 

 entire or toothed ; flowers rather crowded ; segments of the calyx ovate, 

 acute, shorter than tlie roundish (sulphur-yellow) petals." 



/?. major: larger m all its parts ; flowers more crowded. — P. arguta, iVw^i./ 

 in jour. acad. Philad. 7. p. 21, not o{ Pursh. P. glutinosa, Nutt. ! mss. 



Plains of the Rocky Mountains towards the Oregon, Nuttall ! July. 

 /?. Head waters of the Oregon, Caj)t. Wyeth! — " Stem about a span high. 

 Leaflets small, the lower ones roundish ; those of the upper cauline leaves 

 ovate. External sepals much smaller, often toothed. Flowers rather large." 

 Nutt. — The plant which we have joined as a variety of this species seems to 

 be a larger plant, and bears more resemblance to P. arguta. 



/ 35. P. glandulosa (Lindl.) : stem erect, branched above, villous-pubes- 

 cent, viscid towards the summit, as also the peduncles and calyx ; radical 

 leaves pinnately 5-9-foliolate ; leaflets ovate or roundish, those of the nearly 

 sessile cauline leaves obovate or oblong, all deeply and usually doubly ser- 

 rate-toothed and often incised ; stipules mostly entire ; branches of the cj^me 

 elongated and rather loosely-flowered ; segments of the calyx ovate, acute, 

 as long as the broadly oval (yellow) petals. — Lindl. ! hot. reg. t. 1583 ; 

 Hook. Sf Am. ! hot. Beechey, supj)l. p. 338. P. Oregana, Nuit.mss. P. 

 arguta, Hook.fi. Bor.-Am. partly. 



i8. incisa (Lindl.) : leaflets incised ; petals longer than the calyx. — Lindl. 

 hot. reg. t. 1973. 



Oregon and California, Douglas ! Nuttall ! — Flowers about half the size 

 of those of P. arguta; the stem more slender and branching. The stamini- 

 ferous disk is conspicuous, but not glandular. 



X Douhtful or little-known Species. 



36. P. emarginata (Pursh) : assurgent, hirsute ; stipules ovate, entire ; 

 leaves trifoliolate ; leaflets sessile, approximate, incisely toothed, hirsute on 

 both sides ; pedicels few, terminal, elongated, 1 -flowered ; petals cuneate- 

 oblong, emarginate, twice the length of the calyx. Pursh, fl. 1. p. 353. 



Labrador, Kohlmcister. — A small species. Flowers large in proportion. 

 Pursh. — This species has not been identified. It may be, as Hooker suggests, 

 the P. nana of Lehmann, which Hooker found among the plants collected by 

 Kohlmeister. But E. Meyer {pi. Lahrad. p. 74) has described under this 

 name a plant apparently different from P. nana. 



■ 37. P. dissecta (Pursh) : erect, branched, rather glabrous ; leaves digi- 

 tately 5-foliolate ; leaflets pinnatifid ; the lobes entire, acute ; flowers termi- 

 nal, somewhat corymbose. Pursh, fl. I. p. 355. 



Near Hudson's Bay. Perennial. — Described by Pursh from a specimen 

 in the Banksian herbarium. 



