214 ICOSANDRIA MOISTOGYIMA. [CL. XII, 



12. COMA'RUM. Calyx ten-cleft. Petals five. Seeds naked, even, 



on the surface of a spongy, hairy, permanent receptacle. 

 8. POTENTI'LLA. Calyx ten-cleft. Petals five. Seeds naked, 

 rugged, fixed to a small dry receptacle. 



(Spircea Ulmaria and Filipendula.) 



ICOSANDRIA. MO NOG YNI A. 



1. PKU'NUS. CHEEKY. 



Calyx inferior, of one leaf, bell-shaped, deciduous, with five 

 obtuse marginal segments. Petals five, roundish, spreading,, 

 larger than the segments of the calyx. Filaments awl-shaped, 

 nearly as long as the corolla ; anthers short, two-lobed, round. 

 Germen superior, roundish. Style thread-shaped, terminal, as 

 long as the stamens ; stigma round. Drupe roundish. Nut 

 very hard, one-celled, two-valved. The valves prominent at 

 the margin. Kernel solitary, suspended from the top. Name, 

 P?'oune, of Theophrastus. 246. 



1. P. Pddus. Bird Cherry. Flowers in pendulous clusters ; 

 leaves inversely egg-shaped, deciduous, with two glands at the 



base beneath. A small, tree with smooth branches : acute, 



doubly serrate leaves : beautiful clusters of white flowers, and 

 small black harsh drupes. Flowers in May : grows in woods in 

 Scotland and the north of England : frequent. Eng. Bot, vol. xx. 

 pi. 1385. Eng. Fl. vol. ii. p. 354. 731. 



2. P. Cerasus. Wild Cherry. Gean-tree. Flowers in nearly ses- 

 sile umbels ; leaves broadly lance- shaped, somewhat downy be- 

 neath. A tree, with very smooth bark : pointed, serrated leaves, 



with two unequal glands at the base : white flowers, and black 

 sweet drupes. Several varieties occur, differing chiefly in the co- 

 lour of the fruit. FJowers in May : grows in woods and hedges : 

 common. Eng. Bot. vol. x. pi. 706. Eng. FL vol. ii. p. 354. 732. 



3. P.insititia. Wild Bullace-tree. Flower-stalks in pairs ; leaves 

 between egg-shaped and lance-shaped, downy beneath ; branches 



ending in a thorn. A small tree, with spreading round branches : 



leaves on small lateral branches, alternate, serrate : flowers on sim- 

 ple stalks, not much longer than the calyx : petals white : fruit 

 globular, austere, black, with blue bloom. Flowers in April : 

 grows in woods, thickets and hedges. Eng. Bot. vol. xii. pi. 841. 

 Eng. Fl. vol. ii. p. 356. A variety without thorns is not unfrequent. 

 It is the P. domestica, Wild Plum-tree. Eng. Bot. pi. 1783. 733. 



4. P. spinosa. Sloe-tree. Blackthorn. Flower-stalks generally 

 single ; leaves between elliptical and lance-shaped, smooth ; 

 branches ending in a thorn. A small tree or bush, with irregu- 

 larly spreading round branches : leaves serrate : flowers very nu- 

 merous, with pure white petals : fruit black, with a bluish bloom, 

 very austere. Flowers in March and April : grows in thickets, 

 hedges, and on dry banks : common. Eng. Bot. vol. xii. pi. 842. 

 Eng. Fl. vol. ii. p. 357. 734. 



