3(J2 



NATUBAL mSTOBY OF PLANTS. 



Ironi the Altai and the Himalayas, whose flowers are polygamous, 

 but in other respects altogether those of Sihhaldia. 



In the above reduced types which we have referred to the genus 

 Putentilla, when the androceum is only isostemonous, the persisting 

 stamens are those superposed to the sepals. In the plants of which 

 the genus (liamarliodus^ has been made, the five oppositipetalous 

 stamens alone persist.^ The number of carpels varies ; the ovule is 

 always that qI PotentUla, and the style is inserted at a variable height 

 on the internal angle. The inflorescence is often, as in Stellar iopsis, 

 analogous to that of the Carijojjhi/llacea, and the hracteolcB forming 

 the calycle are absent or reduced to very rudimentary glands, as we 

 shall lind is the case in certain species of Geum. Thus, Chamcerhodos 

 is no more separable from the genus PotentUla than Sibbaldia, Ivesia, 

 &c,, and ibrms only a section apart. This is represented by four or 

 five herbaceous plants, with the stem frutescent at the base, and 

 with alternate leaves like those of the Tormentil ; they are found in 

 the centre and north of Asia, and also in America on the Rocky 

 Mountains. 



Thus constituted, the genus Poientilla, with its eleven sections,' 

 includes about two hundred and fifty species, according to most 

 descriptive works; but this number should be reduced by at least 

 a third. 



The Brambles' (Fr., Bonces — figs. 428-431) may be very briefly de- 

 fined now that we know the two preceding genera. Their flowers are 

 those of the Strawberries and Potentils, but have no calycle ; and their 

 fruits coAisist of a variable number of drupes, not achenes, inserted 

 on the convex surface of a receptacle which is less fleshy than in 



' BoE., Ledeh. Fl. AU., \. ^129.— Ledeb., 

 Icon. Fl. Ross., t. 257, 271.— Ekbl., Gen., n. 

 63G5. — ToKK. & Ge., Fl. Bor.-Amer., i. 433. 

 — Walp., Rep., ii. 37, 913.— B. H., Gen., 621, 

 n. 19. 



• Kach consists of a rather slender filament 

 and an introrse two-celled anther. On the inner 

 fiu-e these cells are only separated fioni another 

 by a shallow prfwve; the lines of dt.'hiscence 

 fonn two arcs witli their concavities facing, and 

 finally almost tonch at both ends, marking out a 

 siirt of flap, the fonn of which might at first 

 sight give the impression that the anther was 

 unilocular. 



» rulentilla. 



J ( 1. Po{f-ntilla.slrum{SEn.). 

 ■ ) 2. Tonnenlilla. 



Sections 11 

 {continued). 



Sections 11. 



3- Comariim. 



4. Fragariastrum. 



5. Trichoilialamus. 



6. SihhahUa. 



7. Dryadanthe. 



8. Korkelia. 



9. Ivesia. 



10. Stellariopsis. 



11. ChamcBrhodos. 



•* Ruhus L., Gen., n. 632. — Adans., Fam. des 

 PL, ii. 294.— J., Gen., 338.— Gjjbtn., Fruct., 

 i. 350, t. 73.— Lamk., Bid., vi. 235 ; Suppl., iv. 

 693; III., t. 441, fig. 1.— DC, Prodr., ii. 556.— 

 Spach, Suit, a Rttffon, i. 453. — Endl., Gen., 

 n. 6360.— Payee, Organog., 503, t. ci. figs. 1-12. 

 —15. H., Gen., 61G, n. 36.— ? Cylactis Kaf., 

 Hillim. Jouni. (1819), 377 (ex Endl.). 



