ERICACEAE. 219 



4. R. viscosum Torr. : branchlets hispid ; leaves oblong-obovate, acute, 

 smooth and green on both sides, ciliate on the margin, the midrib bristly ; 

 flowers glutinous, hairy, appearing with the leaves ; tube as long again as 

 the segments ; stamens scarcely longer than the corolla. Azalea -viscosa 

 Linn, and A. glauca Pursh. 



Woods. Can. to Geor. June. }^ . Stem 6 8 feet high, much branched. 

 Leaves 1 2 inches long, sometimes glaucous beneath. Flowers white, in ter- 

 minal clusters, sweet scented. Corolla viscid and pubescent. 



White Wild Honeysuckle. 



5. R. calendiduceum Torr. : branchlets somewhat villous ; leaves oblong, 

 pubescent on both sides, at length hirsute ; flowers large, in rather naked 

 corymbs, not viscid ; teeth of the calyx oblong ; tube of the corolla hairy, 

 shorter than the segments. Azalea calendulacea Mich. A. nudiflora var. 

 coccinea Ait. 



Penn. to Car. May. On Clear Creek, Ohio, Dr. J. M. Bigelow. \i .Stem 

 2 6 feet high. Flowers yellow or flame-color. One of the handsomest shrubs 

 in the U. S. Yelloiv-flowered Rose-bay. 



6. R. arborescens Torr. : branchlets smooth ; leaves obovate, somewhat 

 obtuse, smooth on both sides, glaucous beneath, ciliate on the margin, midrib 

 almost smooth ; flowers in leafy corymbs, not viscid ; tube longer than the 

 segments; calyx leafy, with the segments oblong, acute; filaments ex- 

 serted. Azalea arborescens Pursh. 



Blue Mountains, Penn. May July. fj. Pursh.Stem 1020 feet higtx. 

 Flowers large, reddish ; scales of the flower-buds large, yellowish-brown, sur- 

 rounded with a fringed white border. Pursh. Arborescent Azalea. 



7. R. nitidum Torr. : branches somewhat smooth ; leaves oblanceolate, 

 submucronate, coriaceous, smooth on both sides, shining above; midrib 

 bristly beneath, margin revolute-ciliate ; flowers viscid, in leafy corymbs ; 

 tube a little longer than the segments ; calyx very short. Azalea mtida 

 Pursh. 



Mountain swamp*. N. Y. to Virg. June, July. T^ Leaves dark green and 

 shining, smaller than in any other species. Flowers white, with a reddish tinge. 

 Pursh. Shining Rhododendron. 



8. R. hispid-urn Torr. : branches straight, very hispid ; leaves long-lan- 

 ceolate, hispid above, smooth beneath, glaucous on both sides, ciliate on 

 the margin, the midrib bristly ; flowers very viscid, appearing with the 

 leaves ; tube scarcely longer than the segments ; teeth of the calyx oblong, 

 rounded ; filaments exserted. Azalea hispida Pursh. 



Margins of lakes, on high mountains. N. Y. arid Penn. Pursh. July, Aug. 

 p^. Stem 10 15 feet high. Flowers white, with a red border. Stamens often 

 10. This shrub is said by Pursh to have a bluish appearance, by which it may 

 be distinguished from all others at a great distance ; but Dr. Torrey thinks it is 

 scarcely distinct from R. viscosum. Hispid Rhododendron. 



13. AZALEA. Linn. Azalea. 



(Supposed to be derived from the Greek aga\e.os, dry, from its habitat.) 

 Calyx 5-parted. Corolla short, campanulate, 5-cleft. Sta- 

 mens 5, equal, shorter than the corolla ; anthers opening longi- 



