PENTANDRIA— MONOGYNIA. RHamnus. 327 



P. rectum sylvestre. Gesn. Ic. Pkt.fasc. 1 . 36. t. 14./. 47. 



Xylosteum. Dod. Pempf. 412. f. Riv. Monop. Irr. t.VIO. 



In thickets and rocky places. 



In the fissures of rocks, under the Roman wall near Shewing- 

 Sheels, or rather Sewenshele, Northumberland. JVallis. Plen- 

 tifully, and certainly wild, in a coppice called the Hacketts, to 

 the east of Houghton bridge, 4 miles from Arundel, Sussex. Mr. 

 Borrer. 



Shrub. July. 



Stem erect, bushy, 4 or 5 feet high, with numerous, round branches ; 

 the young ones leafy and downy. Leaves deciduous, stalked, 

 ovate, acute, dull green, soft and flexible. Fl. small, cream- 

 coloured, or reddish, scentless, in pairs, on axillary simple stalks. 

 Bracteas hairy, double ; the 2 outermost lanceolate, spreading ; 

 inner a small concave scale under each germen. Cal. in 5 ob- 

 tuse lobes. Cor. downy. Berries scarlet, oval, distinct, of 1 

 cell, with about (I seeds in each. A shrub of little beauty, and 

 no known utility, thougli common in plantations ; where I have 

 never seen any ripe fruit. 



120. RHAMNUS. Buckthorn. 



Linn. Gen. 10.^. J(m.380. Fl. Br. 26 1. Tourn. <.366. Lam. t. 128. 



GcErtn. t. 106. 

 Frangula. Tourn. <.3S3. 



Nat. Ord. TDiimoscE. Linn. 43. Rhamni. Juss. 95. N.\2\ 

 the same. 



Cal. inferior, of 1 leaf, funnel-shaped ; coloured internally ; 

 limb in 5, sometimes only 4, acute, equal, spreading seg- 

 ments. Petals as many as the segments of the calyx, alter- 

 nate with them, small, converging, sometimes imperfect, 

 or wanting. Filam. in the mouth of the calyx, opposite 

 to each petal, awl-shaped, short. Anth. roundish, two- 

 lobed, small. Germ, superior, roundish, seated on a glan- 

 dular disk. Style short, cylindrical, rarely divided. Stigma 

 in 2, 3, or 4 lobes. Ben-y nearly globular, of 2, 3, or 4 

 cells. Seeds solitary in each cell, rounded externally, 

 flattened at the inner side. 



The flowers are often more or less dioecious. 



Stem shrubby. Leaves stalked, simple and undivided. Sti- 

 pulas small, deciduous. Fl. small, on aggregate stalks, 

 yellowish. Berries blueish-black, purgative. 



1. R. calharticus. Common Buckthorn. 

 Thorns terminal. Flowers four-clelt, dioecious. Leaves 

 ovate, serrated. Stem erect. Beiry with four seeds. 



