178 



llOSACEJ!]. Pottiitilla. 



ovvilo solitary, ivacontliiig or susponded. Akouca small, turgid, crustacoous, u-sually 

 Bossilo, 111)011 a thy inoro or lesn olovatod rfci-ptaclo. Iwidiclo siiiiorior. — litnhacoous 

 or mrely woody ; louvi's piimato or digitate with distinct leallcts ; stipules adnato to 

 tlio petioles ; lloweis e.yuiose, or axillary ami solitary. — Lehmuuu, Uevis. Potent. ; 

 Watson, Proc. Am. Acad. viii. 5-l'J. 



A genus of about 120 s|iecies, according to Benthiim & Hooker (who include in it also the next 

 three genera), conlined almost exclusively to the temperate and cold regions of the northern 

 hemisphere. The species are very variable, and many more than this number have been pub- 

 lished, or the 30 or more native to North America, a dozen are also indigenous in Europe or 

 Northern Asia. 



* Styles fusiform, thickeued and ylandular at base: carpels very numerous, (jlabrous : 



Jlowers cjjviost. 



1. P. glandulosa, Lindl. Perennial, erect, a foot or two high, somewhat glan- 

 dular-villuus, branelied above : leaves pinnate ; leallets 5 to 9, rounded, ovate, or 

 somewhat rhondjoidal, coarsely serrate, an inch or two long : cymes at length open 

 and pedicels slender, the upper leaves and floral bracts conspicuous : calyx 4 to 6 

 lines long, somewhat tomentose and usually villous with coarse hairs ; bractlets 

 linear to oLlong, shorter than the lobes : jictals yelh)w or sometimes white, usually 

 bhortor than tho calyx : stamens Uf), in one row on the margin of the thickened 

 disk: style uttatrhe.l below the midtlle of tho ovary. — ]5ot. Keg. t. lOH.'i. 1'. Wrua- 

 (jeliana, Kischer iV; Meyer; Lehni. Kevis. -ID, t. ID. 



Var. Nevadensis, Watson. A slender form with small leallets : inllorescenco 

 more naked, the u[)per leaves and lloral bracts being much smaller: calyx 2 to 4 

 lines long : tlowers white or yellow : stamens occasionally ordy 20. 



From Monterey northward to Washington Territory ; the variety in the Sierra Nevada from 

 tho South Fork of Kern Kiver {Rothrock) to Oregon. P. Jissa, Nutt., is a usually low and slender 

 fonn of this species with occasionally 5 pairs of leallets, common in tlie Uocky Mountains ; it 

 does not appear to have l)een collected in California. 



2. P. rivalis, Nutt. Annual or Liennial, erect or ascending, often dilVusely 

 brancheil, softly villous with spreading hairs or nearly glabrous : leaves pinnate, 

 with 2 pairs of closely ai)proximate leallets, or a single pair and the terminal leallet 

 3-parted ; upper leaves ternate ; leallets cuneate-ovate to -lanceolate, coarsely serrate, 

 1 to U inches long: cymes loose, with slender pedicels: bractlets and calyx-lobes 

 equal, "U to 3 lines long: petals minute, yellow: disk not thickened: stamens 10 

 to 20 : siyle terminal. — Torr. & Gray, Fl. i. 437. 



Var. millegrana, Watson, 1. c Leaves all ternate : akenes usually small and 

 light-colored. — i'. milleiirana, Kngelm. ; Lehm. Kevis. 202; Watson, l5ot. King 

 Exp. 85. 



The variety ranges from the eastern slope of the Sierra Nevada, and from Fort Mohave {Cooper), 

 eastward to New JSIexico and the Alissouri. The typical form is not found west of tlio Rocky 

 Mountains. 



* * Style filiform, te7-minal : carpels glabrous: stamens 20: herbaceous peren7na/s, 



zvith cymose yellotv flowers. 



-»- Leaves pinnate or digitate, with 5 or more {rarely 3) leajhls : bractlets shorter 



titan the sepals. 



3. P. Bre"weri, Watson. Alpine, densely white-tomentoso throughout, tlu; calyx 

 and upper leaves silky-villous with apprcssed hairs : stems decumbent at base, 

 rather stout, 3 to 10 inches high : stipules broad, mostly incised ; leallets 7 to 13, 

 nearly uniform in size, 3 to G lines long, cuneate-obovate, deejily incised : cymes 

 mostly crowded : petals emarginate, 3 to 4 lines long, touch exceeding the calyx : 

 carpels 20 to 25, on villous pedicels; the receptacle and disk hairy. — Proc. Am. 

 Acad. viii. 555. 



