562 



ROSACES. XIII. TORMENTILLA. XIV. COMARUM. XV. HoRKELIA. XVI. SlBBALDIA, &C. 



branched ; leaflets 3-5, obovate, deeply toothed, hairy, as well 

 as the petioles ; stipulas lanceolate, entire ; pedicels lateral, 1- 

 rlowered, long, and slender ; petals obcordate. !{. . H. Native 

 of Europe, about hedges and the borders of fields. In Britain 

 in several parts of Oxfordshire, and at Braintree, Essex ; at La- 

 kenham, near Norwich ; in Hertfordshire and Surrey ; at Bright 

 House, near Halifax, Yorkshire ; in barren grounds of Scotland. 

 Smith, engl. bot. 864. Potentilla procumbens, Sibth. Potentilla 

 nemoralis, Nestl. pot. 65. Plot's tormentil, Pet. herb. brit. t. 

 41. f. 10. Flowers sometimes with 5 petals. 



Creeping Tormentil. Fl. June, July. Britain. PI. pros. 



3 T. HUMIFU'SA ; floriferous stems short and filiform, pro- 

 cumbent; leaflets 5, cuneate- oblong, obtuse, deeply toothed, 

 clothed with white tomentum beneath. 1. H. Native of North 

 America, in the plains of the Missouri. Potentilla humifusa, 

 Nutt. gen. amer. 1. p. 130. 



Trailing Tormentil. PI. trailing. 



Cult. Plants of the easiest culture and propagation ; how- 

 ever they are not worth growing except in botanical gardens, to 

 fill up the arrangements. 



XIV. CO'MARUM (from icojuapoc, comaros, the arbutus; 

 similar in fruit). Lin. gen. no. 638. Smith, engl. fl. 2. p. 433. 



LIN. GEN. Icosdndria, Monogynia. Calyx 10-parted, the 5 

 outer segments accessory and small. Petals 5, lanceolate, shorter 

 than the calyx, attached to the rim of the calyx along with the 

 stamens. Styles lateral. Carpels or akenia numerous, seated 

 on a large, dry, spongy, hairy, hemispherical receptacle. An 

 herbaceous creeping plant, with broad pinnate and ternate leaves, 

 and terminal panicles of purple flowers. 



1 C. PALU'STRE (Lin. spec. 718.) 7. H. Native of Europe, 

 Siberia, and North America, in marshes ; plentiful in Britain. 

 Smith, engl. bot. 173. Schkuhr, handb. t. 138. f. 1. Fl. dan. 

 637. Potentilla Comarum, Scop. fl. earn. ed. 2. vol. 1. p. 359. 

 Potentilla paliistris, Lehm. pot. 32. Potentilla rubra, Hall. fil. 

 in Ser. mus. helv. 1. p. 5, 6. Root creeping. Steins ascending. 

 Leaves pinnate. Leaflets broad, acutely serrated, green above, 

 but glaucescent beneath. Flowers pedicellate, axillary, and ter- 

 minal, dark purple ; petals lanceolate, acuminated, much shorter 

 than the calyx. The roots dye wool of a dirty red-colour, and 

 have astringency enough with other plants of the same class to 

 tan leather. In Scotland the fruit arc called corn-berries. 



Marsh Cinquefoil. Fl. June, July. Britain. PI. 1 to IJfoot. 



Cult. This plant will grow in any kind of moist soil, and is 

 increased by dividing at the root. 



XV. HORKE'LIA (in honour of John Horkel, professor of 

 physiology at Berlin). Cham, et Schlecht. in Linnaja. vol. 2. p. 

 27. Hook. fl. bor. amer. p. 196. 



LIN. SYST. Decandna, Polygynia. Calyx campanulate, semi- 

 10-cleft, outer segments accessory. Petals 5, small. Stamens 

 10, inserted by 2 series in the sides of the calyx. Ovaries nu- 

 merous, seated on a dry, conical, villous, receptacle. Styles 

 simple, articulated with the ovaries, almost terminal. Akenia 

 inclosed in the calyx.- Erect herbs, with pinnate leaves, and 

 crowded terminal insignificant flowers. 



1 H. CONGE'STA (Dougl. mss. Hook. bot. mag. 2880.) radical 

 leaves pinnate ; leaflets cuneate-oblong, cut at the apex ; outer 

 calycine segments quite entire ; petals longer than the calyx. 

 If.. H. Native of California, at Cape Mendocino, and on the 

 low hills of the Umtqua river in lat. 41 to 42. Corolla white. 



CVon-derf-flowered Horkelia. Fl. Aug. Clt. 1826. PI. 1 to 2 ft. 



2 H. CALIFORNICA (Cham, et Schlecht. in Linnasa. 2. p. 27.) 

 erect, clothed with viscid pili ; leaves pinnate and pinnatifid; 

 flowers panicled ; petals shorter than the calyx. I/ . H. Na- 

 tive of California. Sibbaldia Californica, Spreng. syst. app. p. 

 341. Corolla white. 



Californian Horkelia. PI. 1 to 2 feet. 



Cult. The species of Horkelia will grow in any common 

 garden soil, and are readily increased by dividing at the root. 



XVI. SIBBA'LDIA (in honour of Robert Sibbald, professor 

 of physic at Edinburgh, author of Scotia Illustrata, 1684, &c.) 

 Lin. gen. 393. Lam. ill. t. 221. D. C. prod. 2. p. 586. 



LIN. SYST. Penta-Decdndria, Penta-Decagynia. Calyx flat- 

 tish, 10-cleft, the 5 outer segments accessory. Petals 5, linear- 

 spatulate. Stamens 5-10. Styles 5-10, lateral. Carpels or 

 akenia 5-10, seated on an almost naked receptacle. Evergreen, 

 dwarf, glandless herbs, with trifoliate leaves, and glomerate or 

 corymbose heads of yellow or white flowers. 



1 S. PROCU'MBENS (Lin. spec. 406.) leaves trifoliate ; leaflets 

 equal, cuneated, and coarsely toothed at the apex, rather pilose ; 

 flowers corymbose ; petals shorter than the calyx. I/ . H. 

 Native of Europe, Siberia, and North America, on high moun- 

 tains. Plentiful on the summits of the highland mountains of 

 Scotland, in micaceous soil. Smith, engl. bot. t. 897. Fl. dan. 

 32. Petals small, yellow. 



Procumbent Sibbaldia. Fl. July. Scotland. PL 1 to 3 inches. 



2 S. ADPRE'SSA (Bunge in Led. fl. ross. alt. ill. t. 276. fl. alt. 

 1. p. 429.) leaves ternate; lateral leaflets oblong-lanceolate, 

 quite entire, intermediate one cuneated, tripartite, with the lateral 

 segments entire, and the middle one tridentate at the apex, 

 silky beneath ; flowers with 10 stamens and 10 styles; petals 

 equal in length to the calyx. If. . H. Native of Altaia, on high 

 dry fields at the rivers Kan and Tschuja. Petals white. 



Adpressed Sibbaldia. PI. ^ foot. 



3 S. PARVIFLORA (Willd. act. soc. berol. vol. 2.) leaves trifo- 

 liate ; leaflets beset with strigose pili on both surfaces ; flowers 

 in glomerate heads ; petals obovate, one-half shorter than the 

 calyx. 11 . H. Native of Cappadocia. Fragaria orientalis flore 

 luteo, Tourn. cor. 21. Petals yellow. 



Small-flowered Sibbaldia. Fl. July, Aug. PI. \ foot. 



Cult. Sibbaldia is a genus of small alpine plants. They do 

 best in small pots in a mixture of peat, loam, and sand, and are 

 increased by dividing. 



XVII. CHAMyERHO'DOS (from x a /""> chamai, on the 

 ground, and pocog, rhodos, a rose, dwarf-rose). Bunge in Led. fl. 

 ross. alt. ill. t. 257. fl. alt. l.p. 429. Hook. fl. bor. amer. p. 196. 

 Sibbaldia species of Lin. D. C. and others. 



LIN. SYST. Pentandria, Penta-Decagynia. Calyx campanu- 

 late, 5-cleft. Petals 5, obovate. Stamens 5. Styles lateral, 

 rarely 5, usually 10 or more. Carpels 5-10 or more, seated on 

 a villous receptacle. Small plants, with dissected leaves, beset 

 with glandular pili. Corolla white or purple. 



1 C. ERE'CTA (Bunge in Led. fl. alt. 1. p. 431.) herbaceous, 

 pubescent ; stems elongated, racemosely panicled ; radical leaves 

 alternately multifid, upper cauline ones 3-5-cleft ; segments 

 linear-filiform ; flowers pentandrous ; styles 5-20 ; petals ex- 

 ceeding the calyx. $ . F. Native of Siberia, and Altaia, in 

 pine woods, and of North America about Carlton House, on the 

 Saskatchawan, as also among the Rocky Mountains. Aram. ruth. 

 p. 58. t. 25. Lam. ill. t. 221. f. 2. Sibbaldia erecta, Lin. spec, 

 p. 406. Corolla purple. 



Erect Chamserhodos. Fl. June, Aug. Clt. 1806. PI. 1 ft. 



2 C. GRANDIFLORA (Bunge, fl. alt. 1. p. 431.) stems numerous, 

 erect, leafy ; leaves divided into numerous linear segments, pu- 

 bescent ; petals twice the length of the calyx. l/.H. Native 

 of Dahuria, on granite rocks near Ouda, and at the river Selenga. 

 Sibbaldia grandiflora, Pall, in Willd. rel. ex Schultes, syst. 6. 

 p. 770. Corolla red, larger than that of C. ertcta. 



Greal-flonered Chamserhodos. PI. 1 foot. 



3 C. SABULOSA (Led. fl. ross. alt. ill. t. 257. fl. alt. 1. p. 432.) 

 plant suffruticose, clothed with clammy villi, tufted ; stems as- 



