ERICACEAE. 



to oblanceolate, 5-10 cm. long, short-petioled, narrowed at the base, glabrous or 

 with a few scattered hairs above, ciliolate, green on both sides; flowers white, fra- 

 grant; pedicels glandular; corolla 3.5-5 cm. long, the limb 2.5-5 cm - broad, more 

 or less 2-lipped, much shorter than the slender, very viscid, densely glandular tube; 

 capsule 10-14 mm. high, glandular-bristly. In swamps, Me. to Ohio, Fla. and 

 Tex. June-July. 



Azalea viscosa hispida (Pursh) Britton. Pedicels bristly-hispid; flowers, at least the 

 limb, pink; leaves glaucescent beneath ; shrub 2-5 m. high. Borders of ponds, Shawan- 

 unk Mts. to Penn. and Montauk Point, N. Y. 



Azalea visc6sa glauca Michx. Leaves white-glaucous beneath, 2.5-5 cm. l n g shrub 

 3-18 dm. high. Mass, to Va. 



Azalea visc6sa nitida (Pursh.) Britton. Leaves about 2.5 cm. long, bright green on 

 both sides ; low shrub. Mass, to Va. 



3. RHODORA L. 



A shrub, with oval or oblong short-petioled alternate leaves. Flowers umbel- 

 late or short-corymbose, short-pedicelled. rose-colored, purple, or nearly white, 

 from terminal scaly buds. Calyx minute. Corolla 2-lipped, the upper lip un- 

 equally 2-3-lobed, the lower divided to the base, the segments recurved. Stamens 

 10, about equalling the corolla; anthers attached by their backs to the filaments. 

 Ovary 5-celled; ovules numerous; style slightly exserted; stigma capitate. Cap. 

 sule linear-oblong, 5-celled, 5-valved from the summit, many-seeded. [From the 

 Greek, rhodon, a rose.] A monotypic genus. 



i. Rhodora Canadensis L. RHODORA. (I. F. f. 2748.) Stems 3-9 dm. 

 high; twigs sparingly strigose. Leaves obtuse and mucronulate, entire, dark green 

 and glabrous, or nearly so, above, pale, glaucous and slightly pubescent, at least 

 on the veins, beneath, 2.5-5 cm - lon g> 6-I 4 mm - wide " flowers expanding with or 

 before the leaves; pedicels very short, hairy; corolla 2.5-4 cm. broad; capsule 

 puberulent, glaucous. 10-14 mm - high. In bogs and on wet hillsides, Newf. to 

 N. J., Quebec, central N. Y. and Penn. May. 



4. RHODODENDRON L. 



Leaves alternate, persistent, coriaceous. Flowers purple, rose-colored or white, 

 corymbose or umbellate, from scaly cone-like buds. Calyx 5-lobed or 5-parted. 

 Corolla campanulate, 5-lobed, nearly regular. Stamens 5-10 (usually 10), little 

 exserted, declined or equally spreading. Anthers attached by their backs to the 

 filaments, the sacs opening by terminal pores. Style slender; stigma capitate or 

 5-2O-lobed; ovules numerous. Capsule mostly woody, 5-2O-valved from the sum- 

 mit. Seeds numerous. [Greek, rose-tree.] About 100 species, natives of the 

 northern hemisphere. Besides the following, some 5 others occur in the southern 

 and western parts of N. Am. 



Arctic-alpine shrub, 5-30 cm. high; leaves small, lepidote. x. R. Lappom'cum. 

 Tall shrubs or low trees; leaves large, glabrous. 



Leaves usually acute at both ends; calyx-lobes oblong, obtuse. 2. R. maxi'trum. 



Leaves mostly obtuse at both ends ; calyx-lobes short, acute. 3. R. Catawbiense. 



1. Rhododendron Lapponicum (L.) Wahl. LAPLAND ROSE BAY. (I. F. f. 

 2749.) Depressed-or prostrate. Leaves oval, elliptic or oblong, obtuse and mu- 

 cronulate, 8-18 mm. long, 4-8 mm. wide, short-petioled; flowers few, on short 

 pedicels with scurfy scales; calyx-lobes oblong, obtuse, pubescent; corolla purple, 

 5-lobed, 14-18 mm. broad, the lobes oblong, obtuse; capsule ovoid-oblong, 4-6 mm. 

 high.. Summits of the higher mountains of N. Eng. and the Adirondacks of N. Y. ; 

 Quebec to Greenland and Alaska. Delles of the Wisconsin River. Also in Eu- 

 rope and Asia. Summer. 



2. Rhododendron maximum L. GREAT LAUREL. ROSE BAY. (I. F. f. 

 2750.) A tall shrub, or sometimes a tree. Leaves oblong, lanceolate-oblong or 

 broadly oblanceolate, dark green on both sides, 1-2 dm. long, 2.5-6.5 cm. wide, 

 drooping in winter; petioles stout, 12-25 mm. long; pedicels viscid -pubescent, 

 2.5-5 cm< l n g; corolla 3.5-5 cm. broad, about 2.5 cm. long, rather deeply 5-cleft 

 into oval obtuse lobes, rose-color, varying to white, sprinkled with yellowish or 



