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1. Plants without chlorophyll, mycotrophic; pollen in monads
............................................................ Monotropa uniflora
1. Plants with chlorophyll, autotrophic; pollen in tetrads.
2. Plants with more or less herbaceous habit; embryos undifferentiated, without developed cotyledons .... Chimaphila maculata
2. Plants shrub- or tree-like, with woody habit; embryos well-developed, with cotyledons.
3. Ovary superior.
4. Corolla polypetalous; flowers 5-7(-9)-merous ....................................................................................... Bejaria aestuans
4. Corolla sympetalous; flowers 5-merous.
5. Inflorescence terminal, paniculate ........................................................................................................ Arbutus xalapensis
5. Inflorescence axillary, racemose.
6. Stamens with filaments geniculate; fruit a nakedcapsule .............................................. Agarista mexicana var. mexicana
6. Stamens with filaments straight; fruit a capsule, surrounded by the fleshy, accrescent calyx.
7. Stems and inflorescences bearing setose, often glandular hairs ............................................................. Gaultheria erecta
7. Stems and inflorescences glabrous or short-pilose, lacking setose hairs ........................................ Gaultheria acuminata
3. Ovary inferior.
8. Pedicel continuous with calyx hypanthium, not articulate;flowers and fruits with pedicels thin and
equalling or longer than the subtending leaves................................................................ Sphyrospermum cordifolium
8. Pedicel articulate with calyx hypanthium; flowers and fruits with pedicels short and thick, much shorter than subtending leaves.
9. Floral bracts large, showy, red; stamens with filaments and anthers alternately unequal .............. Cavendishia bracteata
9. Floral bracts small, inconspicuous, pale green; stamens with filaments and anthers of equal lengths.
10. Leaf margins entire; corolla cylindric-campanulate, glabrous, 9-12 mm long, yellowish-green ...... Vaccinium poasanum
10. Leaf margins crenate to crenate-serrate; corollaurceolate, 4-5 mm long, densely pubescent, white ... Vaccinium secundum
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Agarista mexicana (Hemsl.) Judd
Agarista mexicana var. mexicana Arbutus
Agarista xalapensis Kunth in H.B.K.
Bejaria aestuans L.
Cavendishia bracteata (Ruiz & Pav. ex J.St.Hil.) Hoer.
Chimaphila maculata (L.) Pursh
Gaultheria acuminata Schldl. & Cham.
Gaultheria erecta Vent.
Monotropa uniflora L.
Sphyrospermum cordifolium Benth.
Vaccinium poasanum J.D.Sm.
Vaccinium secundum Klotzsch
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