626 ERICACEAE (HEATH FAMILY) 



SUBFAMILY I. PYROLOtDEAE (PTROLA SUBFAMILY) 



Calyx free from the ovary. Corolla polypetalous. Anthers extrorse in the 

 bud, opening by pores at the base (inverted in the flower). Seeds with a loose 

 and translucent cellular coat much larger than the nucleus. 



Tribe I. CLETHREAE. Shrubs or trees, with deciduous foliage (in ours). Pollen-grains simple. 

 Capsule 3-celled. 



1. Clethra. Sepals and petals 5. Stamens 10. Style 8-cleft at the apex. 



Tribe II. PYR6LEAB. Herbaceous or nearly so, with evergreen foliage. Pollen-grains compound. 

 Capsule 5(rarely 4)-celled. 



2. Chimaphila. Stems leafy. Flowers corymbed or umbeled. Petals widely spreading. Style 



very short and top-shaped. Valves of the capsule smooth on the edges. 



8. Moneses. Scape 1-flowered. Petals widely spreading. Style straight, exserted ; stigma 

 5-rayed. Valves of the capsule smooth on the edges. 



4. Pyrola. Acaulescent. Flowers in a raceme. Petals not widely spreading. Filaments awl- 



shaped. Style long. Valves of the capsule cobwebby on the edges. 



SUBFAMILY II. MONOTROPOtDEAE (INDIAN PIPE SUBFAMILY) 



Flowers nearly as in Subfamily I or III, but the plants herbaceous, root-para- 

 sitic or saprophytic, entirely destitute of green foliage, and with the aspect of 

 Beech Drops. Seeds as in Subfamily I. 



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



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



* * Corolla gamopetalous ; anthers 2-celled. 



6. Pterospora. Corolla ovoid, 5-toothed. Anthers 2-awned on the back, opening lengthwise. 



7. Monotropsis. Corolla broadly bell-shaped, 5-lobed. Anthers opening at the top. 



SUBFAMILY III. ERICOfDEAE (HEATH SUBFAMILY) 



Calyx free from the ovary. Corolla gamopetalous, rarely polypetalous, 

 hypogynous. Shrubs or small trees. 



Tribe I. RHODODBNDEEAE. Fruit a septicidal capsule. Corolla deciduous. 



* Flowers developed from scaly buds. 

 *- Scales or bracts caducous ; anther-cells opening by a hole or chink at the top. 



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



9. Rhododendron. Flowers usually 5-merous. Corolla bell-shaped or funnel-form, lobed or 



parted, often somewhat irregular. Leaves deciduous or evergreen. 



10. Menziesia. Corolla globular-bell-shaped, 4-toothed. Stamens 8. Leaves deciduous. 

 +- - Bud-scales firm and persistent ; anther-cells opening lengthwise ; leaves evergreen. 



11. Leiophyllum. Corolla of 5 separate petals. Stamens 10, exserted. 



12. Loiseleuria. Corolla deeply 5-cleft. Stamens 5, included. 



* * Flowers not from scaly buds ; the bracts leaf-like or coriaceous. 



18. Kalmia. Corolla broadly bell-shaped or wheel-shaped, with 10 pouches receiving as many 

 anthers. Leaves oblong or linear. 



14. Phyllodoce. Corolla ovoid or urn-shaped. Leaves narrow and heath-like. 



Tribe II. ANDROMEDEAE. Fruit a loculicidal capsule (berry-like in no. 22). Corolla deciduous. 



* Calyx dry, not becoming fleshy after flowering. 



4- Anther-cells opening only at the top ; corolla not. salver-shaped. 



++ Corolla campanulate, 4-5-lobed or -parted ; heath-like, with acerose imbricated leaves. 



15. Cassiope. Calyx of ovate imbricated sepals. Capsule globular id, 4-5-valved, the valves 



2-cleft. 



