288 ERICACEAE. (HEATH FAMILY.) 



18. Rhododendron. Corolla bell-shaped or funnel-form. Stamens 10. Leaves evergreen. 



19. Khodora, Corolla irregular, two petals nearly separate. Stamens 10. Leaves deciduous. 



20. Ledum, Corolla regular, all 5 petals nearly separate. Stamens 5 -10. Leaves evergreen. 



* * Anther-cells opening lengthwise. Leaves evergreen. Bud-scales firm and persistent. 



21. Lolgeleuria. Corolla deeply 5-cleft. Stamens 5, included. 



22. Leiophj 11 um. Corolla of 5 separate petals. Stamens 10, exserted. 



Suborder HI. PYROLE^. Pyrola Family. 



Calyx free from the ovary. Corolla polypetalous. Anthers extrorse 

 in the bud. Seeds with a loose and translucent cellular coat much larger 

 than the nucleus. — Nearly herbaceous and broad-leaved evergreens. 



23. Pyrola. Flowers in a raceme. Petals not widely spreading. Filaments awl-shaped. 



Style long. Valves of the pod cobwebby on the edges. 



24. Moneses. Flower single. Petals widely spreading. Filaments not dilated in the mid- 



dle : anthers conspicuously 2-horned. Style straight, exserted : stigma 5-rayed. Valves 

 of the pod smooth on the edges. 



25. Chimaphila. Flowers corymbed or umbelled. Petals widely spreading. Filaments 



dilated in the middle : anthers 2-horned. Style very short and top-shaped, covered by a 

 broad and orbicular stigma. Valves of the pod smooth on the edges. 



Suborder IV. MONOTBOPEiE. Indian-pipe Family. 



Flowers nearly as in Suborders 2 or 3, but the plants herbaceous, root- 

 parasitic, entirely destitute of green foliage, and with the aspect of Beech- 

 drops. Seeds as in Suborder 3. 



# Corolla monopetalous : anthers 2-celled. 



26. Pterospora. Corolla ovate, 5-toothed : anthers 2-awned on the back, opening lengthwise. 



27. Schiveinitzia. Corolla broadly bell-shaped, 5-lobed : anthers opening at the top. 



* * Corolla of 4 or 5 separate petals : calyx imperfect or bract-like. 



28. Monotropa. Petals narrow. Anthers kidney-shaped, opening across the top. 



1. GAYLUSSACIA, H. B. K. Huckleberry. 



Corolla tubular, ovoid, or bell-shaped; the border 5-cleft. Stamens 10: an- 

 thers awnless ; the cells tapering upward into more or less of a tube, opening by 

 a chink at the end. Fruit a berry-like drupe, containing 10 seed-like nutlets. — 

 Branching shrubs, with the aspect of Vaccinium, commonly sprinkled with res- 

 inous dots; the flowers (white tinged with purple or red) in lateral and bracted 

 racemes. (Named for the distinguished chemist, Gay-Lussac.) 



* Leaves thick unci evergreen, not resinous-dotted. 



1. G. brach^cera, Gray. (Box-Huckleberry.) "Very smooth (1° high) ; 

 leaves oval, finely crenate-toothed ; racemes short and nearly sessile; pedicels 

 very short; corolla cylindrical-bell-shaped. — Dry Woods, Perry Co., Pennsyl- 

 vania, near Bloomfield (Prof. Baird), and mountains of Virginia. May. — Leaves 

 in shape and aspect like those of the Box. 



* * Leaves deciduous, entire, sprinkled more or less with resinous or waxy atoms. 



2. G. dumbsa, Torr. & Gr. (Dwarf Huckleberry.) Somewhat hairy 

 and glandular, low (l°-5° high from a creeping base), bushy; leaves obovate- 



