6. Haplophyton A. de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 8: 412. 1844.
[Greek haploos, simple, and phyton, plant, alluding to absence of calycine glands and floral nectaries]
David E. Lemke
Shrubs or subshrubs; latex milky. Stems erect, unarmed, eglandular-pubescent. Leaves deciduous, alternate or occasionally opposite, petiolate; stipular colleters intrapetiolar; laminar colleters absent. Inflorescences axillary, solitary flowers, occasionally 2-flowered, pedunculate. Flowers: calycine colleters absent; corolla yellow, rotate, aestivation sinistrorse [dextrorse]; corolline corona absent; androecium and gynoecium not united into a gynostegium; stamens inserted at top of corolla tube; anthers not connivent, not adherent to stigma, connectives not appendiculate or enlarged, locules 4; pollen free, not massed into pollinia, translators absent; nectaries absent. Fruits follicles, solitary or paired, erect, brown, slender, terete, striate, pubescent. Seeds narrowly elliptic, slightly flattened, not winged, not beaked, comose, not arillate.
Species 2 (1 in the flora): sw United States, Mexico, Central America (Guatemala).
SELECTED REFERENCE Williams, J. K. 1995. Miscellaneous notes on Haplophyton (Apocynaceae: Plumerieae: Haplophytinae). Sida 16: 469–475.
