Cratcegiis.'\ ICOSANDRIA — PENTAGYNIA. 193 



Weston super-mare, Somersetshire. Unenclosed sand-hills, Bootle, 

 4 — 5 miles from Liverpool. The following stations, either for this or 

 7?. alba, have also been communicated to me ; — about Dublin ; — be- 

 tween Cork and Gienmire ; and near Gosport. Fl. June. $ or If. — Mr 

 Borrer informs me that there are specimens of this and its near ally R. 

 alba, intheLinnasan Herbarium, and the difference between them appears 

 ver}'^ slight. R. alba has shorter tlower-stalks and thence more cylin- 

 drical racemes, and the terminal lobe of its leaves is more similar to the 

 rest, (less dilated than that oi R. fruticidosa). 



DODECANDRIA— DODECAGYNIA. 



5. Sempervivum. Linn. House-leek. 



1. S.^iectortim, L. (com)H07i House- leek); leaves ciliated, oflfsets 

 spreading, petals entire and hairy at the margins. E.Bot.t. 1320. 



House-tops and on walls. Fl. July. If. — "Yhejlowers of this well- 

 known and rustic medicinal plant are no less beautiful than they are 

 curious in their structure. The numlier of stamens is in reality 24 ; of 

 which \'l, inserted 1 at the base of each petal, are perfect ; the rest 

 alternating with ihe petals, small and abortive ; some, bearing anthers, 

 open longitudinally and laterally, producing, instead of pollen, abortive 

 ovules! others resemble a cuneate pointed scale, in the inside of which, 

 upon a longitudinal receptacle, are likewise ranged abortive ovules, in 

 the same manner as in the real germen ; — thus exhibiting the most 

 complete transition from stamens to germens, in the same individual 

 flower. See ihe Jig. in Fl. Lond. ed. 2. 



CLASS XII. ICOSANDRIA. 10 or more stamens, 



placed on the calyx. ' 



ORD. I. MONOGYNIA. 1 St>/le. 



1. Prunuo. Ca^. inferior, 5-cleft. Pet. 5. Nut o( the drupe 

 with slightly prominent seams. — Nat. Ord. RosACEiE, Juss. — 

 Named tp&uv^j in Greek ; according to Theophrastus. 



(See Cratcegus in Ord. Pentagynia.) 



II. PENTAGYNIA. 5 Styles, {variable in most of the 



Genera.) 



2. Mespilus. Cal. segments superior, foliaceous. Pet. round- 

 ish. Disk large, secreting much honey. Styles 2 — 5, gla- 

 brous. Fruit turbinate, with the upper ends of the cells, Avhich 



are bony, exposed. Lindl. — Nat. Ord. Rosacea, Juss Named 



from iJjiS'TnXr,, the Greek word for Medlar. 



3. Crat.^gus. Cal. segments superior, acute. Pet. round- 

 ish. Styles 1 — 5. Fruit oval or round, concealing the upper 

 end of the cells which are bony. Lindl. — Nat. Ord. RosACEiE, 

 Juss. — Named from .x^arog, sti'etigth, in allusion to the extreme 

 hardness of the wood. 



1 This Class comprises a most natural groupe, belonging to the Jussieuau 

 Order Rosacf^k. 



VOL. I. O 



