DICOTYLEDONES : POLYPETALJ] : CALYCIFLORJ3. 



638 



the Almond-tree, and nana, are trees of Southern Europe ; P. Persica is the 

 Peach : in the sub- genus Prunophora, the fruit has a smooth stony endocarp; 

 P. communis (spinosa) is the Sloe or Blackthorn ; P. Armeniaca is the Apricot ; 

 P. domestica is the Wild Plum, it has an ovoid fruit and glabrous shoots ; P. 

 imititia is the Bullace, it has a globoid fruit and hirsute shoots : in the sub- 

 genus Cerasus, P. Cerasus, the Dwarf or Morello Cherry, has foliage-leaves at the 



A 



FIG. 433. Diagrammatic longitudinal sections of Rosaceous flowers. A Prunes;. 

 B Potentilleae. C Rosese. D Pomeae : fc calyx ; c corolla; /ovaries ; n stigmata. 



base of its umbellate inflorescences; P. Avium, the Wild Cherry or Gean, has 

 only scales at the base of its inflorescences : in the sub-genus Laurocerasus, 

 P. Mahaleb, the Damson, has fragrant bark; P. Padus, the B rd- Cherry, has 

 elongated racemose inflorescences ; P. Laurocerasu.t,the Cherry-Laurel, has ever- 

 green leaves which somewhat resemble those of the true Laurel ; P. lusitanica 

 is the Portugal Laurel. 



Tribe 4. Poteriea. Flowers often monosporangiate : corolla often absent : 

 ovaries few, often but one, monomerous, enclosed in the cavity of the receptacle 

 which hardens as the seed ripens : ovules solitary, suspended. 



The genus Alchemilla has tetramerous flowers destitute of a corolla, the 

 stamens (4 or fewer) alternate with the sepals ; an epicalyx is present : A. 

 vulgar is, the Lady's Mantle, and A. arvensis, are common. In the genus Pote- 

 rium, the flowers of the sub-genus Sanguisorba (P. ojjicinale, the great Burnet), 

 have no corolla, the four stamens are opposite the sepals, and they have no 

 epicalyx : the flowers of the sub-genus Poterium (P. Sanguiaoiba, the Salad 

 Burned) , resemble those of the pre- 

 ceding, but the stamens are in- 

 definite, and they are polygamous. 

 The flower of Agrimonia is penta- 

 merous ; it has a corolla and in- 

 definite stamens ; the outer surface 

 of the receptacle is beset with 

 bristles. 



TribeS. Potentillea. The ovaries, 

 which are numerous, are inserted 

 upon a prolongation of the axis into 

 the cavity of the receptacle (Figs. 



433 B and 434 B) ; each usually con- 

 tains one ovule. The calyx is often 



FIG. 434. 4 Flower of the Cherry: s pe- 

 duncle ; c corolla ; n stamens ; g style, pro- 

 jecting out of the cavity of the receptacle. B 

 Fruit of the Blackberry, Rubus fruticosus: 

 it calyx ; / fleshy ovaries. 



