214 ICOSANDRIA MONOGYNIA. [ci.. XII. 



12. COMA'RUM. Calyx ten-cleft. Petals five. Seedt 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. 



(Spirtta Ulmaria and Fitipendula.) 



ICOSANDRIA. MONOGYNIA. 

 1. PRU'NUS. CHERRY. 



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, Proune of Theophras- 

 tus. 246. 



1. P. Pddiu. 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. Ctrasus. Wild Cherry. Gean-tree. Flowers in nearly sessile 



umbels; leaves broadly lance-shaped, somewhat downy beneath. 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 colour of the fruit. Flowers 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 simple 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. domtstica, Wild Plum-tree. F.n<;. 

 Bot. pi. 1783. 733. 



4. P. *)iint'sn. Sloe-tree. Blackthorn. Flower-stalks generally single ; 

 leaves between elliptical and lance-shaped, smooth ; branches enclinc 



in a thorn. A small tree or bush, with irregularly spreading round 



branches: leaves serrate: flowers very numerous, with pure white pelaU: 

 fruit black, with a bluish bloom, very austere. Flowers in March ami 

 April : grows in thickets, hedges, and on dry banks: common. Eng. Dot. 

 vol. xii. pi. 842. Eng. Fl. vol. ii. p. 357. 734. 



