288 ericacejE. (heath family.) 



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



19. Rhodora. Corolla irregular, two petals nearly separate. StamenslO, Leaves deciduous. 



20. licdum. Corolla regular, all 5 petals nearly separate. Stamens5-10. Leaves evergreen. 



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



21. Loiseleuria. Corolla deeply 6-cleft. Stamens 5, included. 



22. Leiopllylluin. Corolla of 5 separate petals. Stamens 10, exserted. 



Suborder III. PYROLEjE. Pyrola Family. 



Calyx free from the ovary. Corolla polypetalous. Anthers extrorae 

 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, exaerted : stigma 5-rayed. Valves 

 of the pod smooth on the edges. 



25. Chimaphlla. 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. MOWOTROPE^. 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. Pteroapora. Corolla ovate, 6-toothed ; anthers 2-aWDed on the back, opening lengthwise. 



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



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



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



1. GAYLUSSACIA, H. B. K. HncKLEBERKY. 



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

 thers airnlcss ; 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 and evergreen, not resinous-dotted. 



1. G. braeh^eera, Gray. (Box-Hl-ckleberey.) Verysmooth(l°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. dum6sa, Torr. & Gr. (Dwakf Hucklebeket.) Somewhat hairy 

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



