ENUMERATION OF THE SPECIES 163 



DISTRICT OF COLUMBIA. Bancroft, Four Mile Run, June 6, 1915, 

 E. S. Steele (Nat. Herb. No. 835,632). 



NORTH CAROLINA. Cumberland County: Manchester, June 25, 

 1902, Biltmore Herb. No. 6610 (Nat. Herb. No. 969,584; shrub 

 6-8 ft.). 



Cultivated. A specimen in the Gray Herbarium without locality 

 labeled " 28. A. tomentosa Loddiges." 



This variety differs from the type chiefly in its leaves being finely but rather 

 densely pubescent beneath and more or less so above. No reference to such a form 

 appears in any American flora, but the plant must have been introduced to Europe 

 more than a hundred years ago and was first described by Dumont de Courset, 

 who was in doubt whether it was a distinct species or a variety of A . viscosa and 

 describes it as having wooly branches, lanceolate-oval leaves soft-pubescent on 

 both sides and late appearing white, fragrant flowers. Of the plant cultivated in 

 England as A. tomentosa there is a sterile specimen in the Gray Herbarium which 

 was probably incorporated in the herbarium between 1840 and 1850, as "Torr. 

 and Gray, Flora N. Am." appears on the label. This specimen agrees exactly with 

 the spontaneous specimens cited above and especially with the specimen from 

 Hyattsville. The leaves are generally oblong-obovate, 2.5 to 5.5 cm. long, acute 

 or acutish, sparingly strigillose above, sparingly strigose on the midrib beneath; 

 the petioles and young branchlets are puberulous and sparingly strigose. The 

 leaves in the specimen from Manchester are slightly shorter and broader and more 

 densely pubescent above and not strigillose; the corolla-tube in this specimen is 

 slender, about 2.8 cm. long, rather densely villose and sparingly glandular-pilose. 

 The specimen from the District of Columbia has less densely pubescent leaves and 

 a more glandular and less villose corolla as has the specimen from Hyattsville. 

 This is a rather remarkable variety, as I have not observed in any of the numer- 

 ous specimens of R. viscosum that I have seen any tendency to have the leaves 

 pubescent, although the midrib may be sometimes slightly pubescent below. 



Rhododendron viscosum var. hispidum Voss, Vilmorin's Blumen- 

 gdrt. I. 588 (1894), as forma. Schneider, III. Handb. Laubholzk. II. 

 502 (1911), as var. Rehder in Bailey, Stand. Cycl Hort. V. 2942 

 (1916). 



? Azalea scabra Dumont de Courset, Bot. Cult. ed. 2, III. 335 (1811), as var. 



of A. viscosa. 

 Azalea hispida Pursh, Fl. Am. Sept. I. 154 (1814). Watson, Dendr. Brit. t. 6 



(1825). De Candolle, Prodr. VII. 2, 716 (1839). 

 Rhododendron hispidum Torrey, FL U. S. I. 425 (1824). Loudon, Arb. Brit. 



II. 1144, fig. 948 (1838). G. Don, Gen. Syst. III. 847 (1834). 

 Azalea glauca /3. hispida Heynhold, Nomencl. Bot. Hort. I. 108 (1840). 

 Azalea viscosa var. hispida Wood, Classb. Bot. 490 (1870) ; Am. Bot. Flor. 203 



(1870). Britton in Mem. Torr. Bot. Club, V. 248 (1894); Man. 699 



(1901). Britton & Brown, III. Fl. II. 559 (1897). Porter, FL Pennsylv. 



239 (1903). 



This form differs from the type chiefly in its hispid young branchlets, the glau- 

 cous rather narrow leaves usually strigose above and in the hispid pedicels. The 

 flowers are usually more or less carmine and have according to Pursh frequently 

 ten stamens. The habitat of this form which is described as a shrub 3 to 5 m. tall 



