MR. J, O. BAKEn's MOXOOBAPH OF BRITISH HOSES. 201 



Prickles often with a few aciculi intermixed ; flowers and leaves 

 larger ; styles hairy ; peduncle rarely acicnlate. 



10. quiver ulenta. 



Grroup 4. Canik^. Larger bushes, always lengthened out and 

 arching. Prickles uniform, scattered, decidedly hooked, and 

 thickened downwards. Sepals deciduous or subpersistent, usually 

 naked on the back. Peduncle generally naked, aud leaves naked, 

 or but thinly hairy, and not at all glandular over the surface. 



The only species 11. canina. 



Systyl^, Styles united into a slender column which is pro- 

 truded beyond the disk. Arching or trailing bushes. Prickles 

 uniform, stout, hooked. Sepals deciduous. Fruit late in ripening. 



A high arching bush like canina^ with copiously compound 

 sepals ; the style-column shorter than the stamens. 



12. stylosa, 



A low trailing bush with short slightly compound sepals and a 

 style-column equalling the stamens 13. arvensis. 



Grroup 1. SPINOSISSIMiE. 



K R. spiNosissiMA, Linn, Frutex erectus, ramis brevibus compactis, 

 aculeis confertis subulatis subrectis ad aeiculos copiosos seusim trans- 

 euntibus, foliohs parvis obtusis finuis simphciter serratis utrinqiie 

 omniuo glabris, floribus semper solitariis, sepalis ascendentibus dorso 

 nudis simphcibus persistentibus, fructibus erectis atro-purpureis nudis 

 depresso-globosis, disco nullo. 



R. SPINOSISSIMA, Linn. Sp. Plant, p. 705; Woods, Linn. Trans, xii. 

 p. 178, Herb, 7-15 ; Deseglise, Mon, p. 46, Exsic, 6; Gren. Fl, Jur. 

 p. 226, non Reich. FL Excurs. ii. p. 612. 



R. PiMPiNELLi FOLIA, Linu. Sp. Plant, p. 703 and Herb. ! ; Reich. Fl. 

 Excurs. ii. p. 612; Rent. Cat. p. 63; Fries, Herb. Norjn. x. no. 52; 

 Dumort. a, /3, y, p. 41 . 



Stems usually quite erect, 1 to 3 feet high, with short, stiff, 

 compact branches ; the prickles very dense, with every stage of 

 transition between minute aciculi and the largest, the latter 3 to 4 

 or even 5 lines long, with a long needle-like point, and the lower 

 part but little thickened, spreading horizoutally or slightly de- 

 flexed; the scars 3 lines deep. Branches often bright reddish 

 brown. Stipules quite naked on the back, faintly gland-ciliated. 

 Full-grown leaves 1| to 2 inches long, with 7 to 9 oblong leaflets, 



LTSS. PEOC. — BOTANT, VOIi X{. ^ 



