ENUMERATION OF THE SPECIES 153 



Some of the specimens enumerated above are rather poor and do not show clearly 

 he distinguishing characters of the species and might be taken for forms of R. vis- 

 cosum, but they have been placed here chiefly for geographical reasons, since we have 

 no knowledge that R. viscosum extends farther west than eastern Tennessee. The 

 species was apparently first collected by A. Fendler near Camden, Arkansas, in 1850 

 and about the same tune by C. Wright in Texas. Later it was found by Frank 

 Tweedy at Grapeland, Houston County, Texas, and upon his specimen Dr. Small 

 based his Azalea oblongifolia published in 1903. It was introduced into cultivation 

 through the Arnold Arboretum, where plants were raised from seeds collected in 

 1917 by E. J. Palmer near Washington, Arkansas. 



Rhododendron serrulatum Millais, Rhodod. 241 (1917). Millais 

 & Williams in Rhodod. Soc. Notes, I. 125 (1918). 



Azalea viscosa Hooker in Comp. Bot. Mag. I. 100 (1835), 1 not Linnaeus. 

 Mohr, PL Life Ala. 653 (1901), in part. Small, Fl. S. E. U. S. 883 (1903), 

 in part; Shrubs Fla. 94 (1913); in N. Am. Fl. XXIX. 42 (1914), in part. 



Rhododendron viscosum Chapman, Fl. S. U. S. 265 (1865), not Torrey. 



Azalea serrulata Small, FL S. E. U. S. 883 (1903); in N. Am. FL XXIX. 43 

 (1914). 



Shrub to 7 m. tall, with irregularly whorled branches; young branchlets usually 

 copiously strigose toward the apex and finely villose or nearly glabrous, becoming 

 soon bright red-brown, changing to dull brown or grayish the following year; floral 

 winter-buds glabrous or sometimes grayish pubescent with numerous usually 

 15 to 20 ovate scales mucronate or mucronate-aristate, usually light yellowish brown 

 with a sharply marked dark brown band along the white-ciliolate margin. Leaves 

 elliptic to obovate or obovate-oblong, rarely oblanceolate, 4 to 8 cm. long and 1.5 

 to 3.8 cm. broad, on vigorous shoots often oblanceolate and 8 by 2 cm. large, 

 usually acute, rarely obtuse, gland-tipped, cuneate at the base, serrulate-ciliate 

 on the margins, glabrous above except sparingly short-villose on the midrib, 

 glabrous beneath and strigose on the midrib, or on the upper leaves of shoots 

 soft-pubescent beneath and strigillose and more or less puberulous above, firm at 

 maturity; petioles 1 to 4 mm. long, strigose. Flowers appearing after the leaves 

 and after the winter-buds are at least partly formed from the middle of June to the 

 beginning of August, in 6- to 10-flowered umbel-like racemes; pedicels slender, 1 to 

 2 cm. long, glandular-hirsute and sparingly villose; calyx-lobes semiorbicular to 

 ovate, rarely exceeding 1 mm., eiliate with long glandular hairs; corolla white, 

 funnel-form, very fragrant, the tube cylindric, slender, 2.5 to 3.3 cm. long and about 

 2 mm. wide, slightly dilated at apex, rather copiously glandular-pilose and spa- 

 ringly villose outside, glabrous inside, the lobes ovate-lanceolate, acuminate, 1.2 

 to 1.5 cm. long; stamens exserted, about 1% times as long as tube, exceeding the 

 lobes, glabrous in the upper third, villose below; anthers oblong, 2 to 2.5 mm. 

 long, ochraceous; style considerably exceeding the stamens, 4.5 to 5.8 cm. long, 

 slightly short-pubescent near the base or nearly glabrous, purple above; ovary 

 densely covered with gland-tipped setae. Capsule ovoid-oblong, 1 to 1.3 cm. long, 

 minutely villose and densely glandular-setose. 



GEORGIA. Wayne County : Jessup, October, 1916, T. G. Harbison 

 (No. 240). Charlton County: near Folkston, April 3 (No. 10), 



1 Drummond's No. 190 named A. viscosa by Hooker is represented in the Gray 

 Herbarium by a sheet consisting of two specimens, one with mature leaves, which 

 is R. serrulalum, and one in flower, which is R. canescens. Hooker quotes this 

 number as 198, but No. 198 belongs to Vaccinium dumosum (Gaylussada dumosa). 



