B0SAGE2E. 



361 



single piece ; but they are really made up of numerous little leaflets 

 crowded together, and as it were piled up on one another, being kept 

 in contact by the velvety down with which they are covered. 



Those Ivesias which, hke /. Ii/copodioides,' have only five stamens 

 are in that respect analogous to Sibbaldia" (figs. 4:23-427), which 



Potentilla [Sibbaldia) procumbens. 



Fig. 424. 

 Longitudinal section oiF flower. 



Fig. 426. 

 Carpel. 



Fig. 427. 

 Longitudinal section 



of carpel. 



comprises small plants from the temperate regions of Europe and 

 Asia, and the arctic regions of America, possessing the androceum of 

 FotentiUa pentandra, with the habit, foliage, and floral organization^ 

 of very many alpine species of FofenfUla, from which it is impossible 

 to separate them. Nor is Bryadanthe'^ more distinct; it is a species 



* A. Gbat, Froc. Amer. Acad., loc. cit., 531, 

 n. 4. 



■ L., Qen., n. 393. — J., Gen., 337.— G^etn., 

 Fruct., \. 3-38, t. 73.— DC, Prvdr., ii. 586.— 

 Hung., Ledeb. Fl. Alt., i. 428 — Ledeb., Jco7i. 

 Fl. Boss., t. 276.— Endl., Oen., n. 6367. — 

 Boyle, lllustr. Himal., t. 40, fig. 5. — Jacquem., 

 Toy. Bot.,i.&l. — Walp., Rep., ii. 37; Ann., 

 i. 269. 



3 The androceum may consist of ten stnmens, 

 but it is usually isostemonous. Thus in tlie 

 flowers of S. cuneata KzE., there are only five 

 stamens, alternipetalous, witli introrse anthers, 

 and filaments inserted round the edge of a glandu- 

 lar disk lining the porringer-like receptacle. Tliis 

 disk has five cusps, where the petals, articulated 



at the base, are inserted ; while the stamens are 

 inserted at the middle points of the concave 

 edges. The filament, too, is articulated with 

 the anther. The surface of the disk is covered 

 with hairs between the stamens and the gyn.Tj- 

 ccum. The number of carpels may be much 

 reduced in Sibbaldia, but is here indefinite. The 

 summit of the receptacle rises into a slender foot, 

 dilated into a swelling at the apex where it bears 

 the carpels, each with a little cylindrical stalk, a 

 neaily gynohasic style and an ovule with a single 

 coat, whose micropyie looks upwards and out- 

 wards. 



■» Endl., Gen., n. &Zm.— Sibbaldia tetrandra 

 Ege., Verz. Alt. PJlanz., 25. 



