Plants annual, gen wider than tall, often rounded to cushion-like; taproot red or purple when dry (often staining herbarium paper); floral bracts present
Calyx basally fused, tubular, tube circumscissile in fruit; gynobase < nutlet ......................................................................................................... Greeneocharis
Calyx of distinct sepals, intact in fruit; gynobase > nutlet ...................................................................................................................................... Eremocarya
Plants annual, biennial, or perennial, gen taller than wide, rarely rounded to cushion–like; taproot usually not red or purple when dry; flower
bracts absent or rarely present
Plants biennial or perennial; vegetative leaves basal or tufted; nutlets smooth, rugose, or scabrous, apically broadly rounded to obtuse, ventral groove
apex well below nutlet apex ............................................................................................................................................................................ Oreocarya
Plants annual or rarely biennial or perennial; vegetative leaves gen. cauline, rarely basal; nutlets smooth, papillate, tuberculate, or muricate, apically
narrowly acute to acuminate, ventral groove apex almost to nutlet apex
Plants annual, rarely biennial (perennial in J. racemosa); flowers always chasmogamous; nutlets ovate or triangular-ovate, often heteromorphic in
size and sculpturing, margin angled (rarely rounded), often narrowly winged, densely or sparsely tuberculate, tubercles usually whitish ..................... Johnstonella
Plants annual; flowers chasmogamous or cleistogamous; nutlets lanceolate, lance-ovate, or ovate, usually homomorphic, margin rounded or angled, not winged (except
C. oxygona, C. pterocarya with generally toothed to undulate wings), smooth or papillate/tuberculate, if tuberculate, tubercles gen. not whitish ........ Cryptantha s.s.
