BUBUS.] ROSACES. 121 



Sub-sp. K. HYS'TRIX, Weihe ; stem arching angular, prickles weak subeqnal, 

 bristles glandular and simple hairs moderately numerous, leaflets not imbri- 

 cate green thinly pubescent or finely glabrous beneath, terminal obovate, 

 toothing fine, sepals ascending remarkably leaf-pointed, petals broad. R. 

 Lejeu'nii, Weihe, is a variety with a large lax panicle with patent branches. 

 R. rosa'ceus, Weihe, is a trailing variety with more irregular prickles and 

 narrow petals. Local, from Northumberland southd. ; Ireland. 



Sub-sp. E. PAI/LIDUS, Weihe; stem angular wide-trailing, prickles small 

 copious very unequal, bristles simple and glandular hairs copious, leaflets 

 not imbricate finely toothed densely grey or sometimes white-pubescent 

 beneath, terminal obovate, sepals reflexed not leaf -pointed, petals narrow. 

 R. humifu'sus, Weihe, and It. folio'sus, Weihe, are varieties with the leaves 

 prolonged into the panicle. R. hirtus, Weihe (ficscus, Lees), and Reuteri, 

 Merc., are closely allied forms. R. prce'ruptorum, Boul. (R. pygma'us, Bab., 

 not Weihe, and var. Men'kii, Bab.), is a form between pal'lidus and Blox' ami. 

 Common in woods, from Perth and the Clyde southd., local ; Ireland. 



ft Leaves of barren shoot 3-foliolate. 



Sub-sp. R. GLANDTJLO'SUS, Bdl. ; stem subterete trailing, prickles small 

 straight weak, bristles simple and glandular hairs copious, leaves green 

 thinly pubescent beneath, panicle thyrsoid compound, bristles of rachis 

 very fine and copious, sepals ascending leaf-pointed densely bristly on 

 the back, petals narrow. R. Bellar'di, Weihe (R. denta'tus, Blox.), is a 

 variety with less prickly rachis and sepals and membranous leaves green 

 and nearly glabrous beneath. R. rotundifo'lius, Blox., has prickles stronger, 

 leaves more hairy beneath, sepals less distinctly leaf-pointed. R. Purchasii, 

 Blox., is an obscure plant of this affinity. Local, from Aberdeen southd.; 

 Ireland. 



Sub-sp. R. SALTU'UM, Focke ; stem trailing terete, prickles small very unequal, 

 bristles glandular and simple hairs much fewer than in the last, leaves 

 densely shortly pubescent often white beneath, panicle compound, rachis 

 very wavy, sepals reflexed not leaf-pointed, petals narrow. R. Gunthe'ri, 

 Weihe. Local. 



Sub-sp. K. PYRAMIDA'LIS, Bab. ; stem trailing clothed as in the last, leaves 

 green thinly hairy beneath, panicle subracemose, rachis straight, sepals 

 ascending leaf -pointed, petals narrow. Wales, Worcester, and Devonshire. 



4. DRY'AS, L. 



Prostrate, tufted, scapigerous shrubs. Leaves simple, white beneath ; 

 stipules adnate to the petiole. Floicers solitary, large white, or yellow, 

 cindro-dioeeeons, proterandrous or subproterogynous. Calyx inferior, per- 

 sistent ; lobes 8-9, valvate in bud. Petals 8-9. Stamens many, crowded. 

 Disk concave, hairy. Carpels many, sunk in the calyx-tube ; style ter- 

 minal ; ovule 1, ascending. Achenes many ; styles slender, feathery. 

 DISTRIB. Arctic and Alpine regions of N. temp, zone ; species 2 or 3. 

 ETYM. Spvds, from the oak-like foliage. 



D. octopet'ala, L. ; leaves oblong-ovate coarsely crenate-serrate. D. 

 depressa, Bab. 



