6o THE SMALL FRUITS OF NEW YORK 



between them. Leaves 3-foliolate, petioles and petiolules pubescent, very prickly, also 

 along the midveins; stipules lanceolate-subulate, hirsute, lateral leaflets shortly stalked, 

 obliquely ovate, acute, often with a small lower lobe, terminal leaflet ovate to ovate- 

 lanceolate, rather long pointed, all rather thin, green on both sides, hairy when young but 

 soon glabrescent especially above, doubly and sharply serrate-dentate, the teeth more or 

 less lanceolate. Flowering branches more or less tomentose, angular, prickly; lower leaves 

 3-foliolate, upper one 3-lobed, the uppermost simple, cordate-ovate, all more or less pointed. 

 Flowers axillar and terminal in a loose corymb, large, bisexual; pedicels tomentose, like 

 the calyx with patent slender prickles, eglandular; calyx-lobes ovate-lanceolate with long 

 leafy or pinnate tips, not prickly; petals roundish oblong, white. Fruit black, sweet, 

 elongate. 



Garden origin; only known as cultivated plants, said to have originated 

 in the garden of Judge J. H. Logan, Santa Cruz, California, and now much 

 grown under the name of " Mammoth." Supposed to be a hybrid, but in 

 reality nothing is known about its origin. It is also known as Lowberry. 

 Crosses were made at Geneva, between Mammoth and Cuthbert (red rasp- 

 berry) , between Mammoth and Herbert (red raspberry) , between Mammoth 

 and Agawam (blackberry), between Mammoth and Snyder (blackberry), 

 and between Mammoth and Nanticoke (blackberry) . 



Var. espinatus. Bailey MSS. 



Canes almost smooth and without prickles; petioles, petiolules and midveins with 

 only a few and small prickles. Fruit like those of R. titanus. 



This variety is said to have been discovered in the mountain pass of 

 Tuolumne County, California, and is much grown under the names of 

 " Mammoth Thornless " or " Cory " or " Cory Thornless." 



Series 3. Flagellates. Bailey Gent. Herb. 1:157. 1923. 



Canes prostrate or procumbent, mostly glabrous, and with scattered recurved or hooked 

 prickles. Leaves on turions 3- to s-foliolate, leaflets more or less ovate or obovate, glabres- 

 cent. Flowering branches and leaves usually somewhat more pubescent, slightly prickly: 

 glands absent, except perhaps in hybrids. Calyx-lobes often with foliaceous tips. 



A. Canes more or less terete 



B. Pedicels exceeding the leaves, elongate, the lower ones overtopping the terminal 



one ; flowers few, often rather large R. flagellar is 



BB. Pedicels not exceeding the leaves. Flowers more corymbifonn 



C. Canes prostrate, more prickly; leaves more obtuse; flowers middle sized 



R. arenicola 

 CC. Canes procumbent; leaves more pointed, those of the flowering shoots plicate 



between the close veins; flowers small R. plicatif alius 



AA. Canes strongly angular and furrowed, the prickles strong, placed along the angles; 

 pedicels overtopping the leaves R- velox 



Rubus flagellaris. Willdenow En. PI. 549. 1809; Rydberg N. Am. Fl. 22:473. 

 1911; 'QaWey Gent. Herb. 1:157. 1923- 



