1 34 Rosacea. [Pygeum^ 



XLV.— ROSACEA. 



HERBS, shrubs or trees, 1. alt., simple or compound, with 

 stip. ; fl. bisexual (rarely polygamous) regular ; cal.-tube free 

 from (in Photinia adnate to) ov., segm. 4-6, sometimes with 

 small adnate bractlets (epicalyx) outside ; pet. 4-6 or o ; starcu 

 def. or indef., perigynous ; carp. 1-3 or indef., usually distinct 

 and free though often enclosed in cal.-tube (adnate to it in 

 Photinia), style often basal, ovules 1 or 2 ; fruit various, in- 

 dehiscent, usually of dry (in Rubus pulpy) achenes, in Photinia 

 berry-like; seed without endosperm, cotyledons plane-convex. 



Carp, not included in cal.-tube. 



Carp, solitary; trees {Pnmece) . . . . .1. Pygeum. 

 Carp, numerous. 



Carp, drupaceous; shrubs 2. RUBUS. 



Carp, dry (achenes); herbs 3. POTENTILLA. 



Carp, included in cal-tube, but not adnate to it 

 (Poteriecz). 

 Pet. o. 



L. simple 4. Alchemilla. 



L. pinnate 5. POTERIUM. 



Pet. 5 6. Agrimonia. 



Carp, adnate to cal.-tube (inferior) {Pomece) . . 7. Photinia. 



This is an Order mainly of temperate distribution, and all our 12. 

 species, with the exception of Pygeum zeylanicum, are montane plants. 

 Rubtcs moluccanus also extends downwards into the moist region as low 

 as 1000 ft. No species occurs in the dry region. All the genera are 

 British, except Photinia and Pygeum. 



1. PY6EUM, Gaertn. 



Trees, 1. simple, entire, with 2 glands at base, stip. minute,. 



fi. small, in axillary racemes; cal.-tube obconical, segm. 5 or 6; 



pet. very small, 5 or 6 tomentose ; stam. 12-20 or more,. 



perigynous, spreading ; carp, solitary, free, ovules 2, pendulous, 



style terminal, stigma capitate; fruit transversely oval, 2-lobed, 



indehiscent, pericarp thin, dry ; seed solitary with large 



hemispherical cotyledons. — Sp. 20; 16 in FL B. Ind. 



L. quite glabrous ; stam. 20 or more ; ov. glabrous . 1. P. WlGHTIANUM 

 L. hairy on veins beneath ; stam. 12; ov. hairy . 2. P. ZEYLANICUM. 



1. P. Wig-htianum, Bl. Mel. Botan. 2 (1855). 



Polyodontia zeylanica, Wight, 111. i. 203. Thw. Enum. 102. C. P. 638. 

 Fl. B. Ind. ii.. 319. Wight, Ic. t. 256 (Polyodo7itia zeylanica) from a 

 Ceylon specimen. Bedd. Fl. Sylv. t. 59 (P. zeylanicum). 



