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.

Distribution

sw United States, Mexico, Central America (Guatemala).

Discussion

Species 2 (1 in the flora).

Selected References

None.

Lower Taxa

Haplophyton crooksii