1586 



RUBUS 



RUBUS 



it was determined, in 1898, that Alton had the Dew 

 berry, rather than the Blackberry, when he made the 

 name -ffi. viUosns, it became necessary to revise our no 

 menclature. It was supposed until that time also thit 

 LinnEBUs meant to designate the Dewberry by his S 

 Canadensis, but he really had the Thornless Blacli 

 berry. 



Var. MicliiganSnsis, Card. A strong-growing form 

 with mostly fewer prickles, very large, irregulaih den 

 tate-cut Ifts. and pubescent fl. -clusters. S W Mith , 

 and probably elsewhere. Not known to be m cult 



Var. roribiccus, Bailey. Lucretia Dewberky Figi. 

 697, 698, Vol. I. Very robust form, with laige wedge 

 obovate, deep-cut Ifts., very long pedicels, very Urge 

 fls. (sometimes 2 in. across) and leafy-tipped caljx 

 lobes: fr. large. West Virginia, and in cultivation as 

 the Lucretia Dewberry, which is the most popular cur 

 rent variety. 



33. invlsus, Bailey (B. Canadensis, var imlsus 

 Bailey). Figs. 2213, 2214. Canes strong, terete some 

 what ascending, not very prickly (the prickles straight 

 ish): Ifts. large and rather thin, light green those on 

 the verdurous shoots coarsely and simply toothed and 

 the teeth usually abruptly pointed: fl.-cluster forking 

 with 2-6 long, slender, usually hispid pedicels fls 

 large, with leaf-like sepals. Not uncommon from New 



York to Kansas and the Gulf. — In cultivation as Bartel 2209 Rubus Randii (X ' 

 and other Dewberries. When once understood, this 



species is generally easy to recognize. The best single and flowering shoots of the same plant are preserved in 

 diagnostic character is the large simple toothing of the herbaria. Canes very long, usually wholly prostrate 

 leaflets on the sterile shoots. 



Group 4. The Southern Detvber- 

 ries, with very long, prickly and 

 often hispid canes, narrow per- 

 sistent Ifts., and mostly l-fUJ. 

 peduncles. 

 34. trivi4UB,Michx. 

 S;onTHEEN Dew- 

 berry. Fig. 2215. A 

 most variable and 

 perplexing species, 

 the difiiculties being 

 increased by the fact 

 that the same plant 

 may bear three kinds 

 of leaves: the large, 

 broad Blackberry- 

 like Ivs. on they 



10-15 ft.), thickly armed with prickles and 

 '.ometimes bearing reddish bristles ■ 

 Ifts usuiUy 3 narrow ovate to ob 

 long short pointed, rather shallowly 

 ind sometimes bluntly toothed, the 

 petiole and midribs usually prickly 

 fls of medium size, 



more or less prickly 

 peduncles fi usu 

 dly oblong some 

 times exctllfut but 

 oftener di\ and 



^r 



shoots ; the smaller 



Ivs. on the canes that 2208. Rubus argutus — The Early Harvest Blackberry, 



are to bear fruit and 



which often persist over winter and remain at flowering 

 time; the small Ivs. that appear with or somewhat be- 

 fore the flowers. It is seldom that' the leaves of sterile 



2J07. Cultivated form of Kubus nigrobacc 



the southtin stvtes 

 It lb often a seuous 

 pest m old fields 

 Some of the forms are 

 very distinct, but it seems to be impossible to discover 

 characters by means of which they can be distinguished 

 with even a fair degree of uniformity. Some of these 

 forms have fls. 2 in. across. Fig. 2215 is a drawing of one 

 of the specimens (there are two similar specimens on 

 the sheet) on which Michaux founded B. tririaUs. Bo- 

 tanically, this species is; probably the most perplex- 

 ing of American Rubi. Some of the kinds in the ex- 

 treme South are remarkably robust. Forms have been 

 found with canes 40-50 ft. long and nearly an inch in 

 diameter. 



Group 5. The Western Deu'berries, with pubescent 

 Ivs., and fls. often imperfect. 



35. viti!61ius, Cham. & Schlecht. {B. tirslnus, 

 Cham. & Schlecht. B. macropifalus, BoMgl.). Pacific 

 Coast Dewberry. Widely trailing, with slender, more 

 or less pubescent canes which are provided with long 

 but weak, straight or slightly recurved prickles: Ivs. 

 various, usually thicker and more woolly upon the 

 St Huinate pi ints composed of three ovate, doubly cre- 

 nite toothed It iflets, or sometimes only 3-lobed, the 

 long petnle ind usually the midribs prickly: fls. per- 

 fect stimin ite cr pistillate on different plants, borne on 

 "111 its 6 12 m high, which bear 1- to 2-flowered prickly 

 oi hispid and generally pubescent peduncles, the petals 

 cf the stammate forms large and showy, those of the 

 pistillate forms usually small, the calyx-lobes either 

 short and entire or somewhat prolonged and indistinctly 

 fr of fair size, blackish, mostly rouud-oblong, 



