Rosaceae tribe Exochordeae

Shrubs or trees; unarmed. Leaves alternate, simple; stipules absent or caducous (Oemleria), (rudimentary) free; venation pinnate. Flowers: perianth and androecium perigynous; epicalyx bractlets absent; hypanthium campanulate to turbinate or obturbinate; torus absent or minute; carpels [1–]5, distinct or connate, free, styles terminal, distinct; ovules 1 or 2, apical, collateral. Fruits capsules or aggregated drupes; styles not persistent, not elongate.

Distribution

North America, Asia

Discussion

Genera 3, species 8 or 9 (2 genera, 2 species in the flora).

The base chromosome number for Exochordeae is x = 8. Prinsepia Royle is Asian and is not present in North America. The tribal name Osmaronieae Rydberg, which pertains here, is illegitimate.

Selected References

None.

Lower Taxa

Exochorda, Oemleria

Key

1	Plants synoecious; stipules usually absent; leaf blades membranous, margins entire or serrate in distal 1/2; carpels connate; fruits capsules.	Exochorda
1	Plants usually dioecious, rarely monoecious; stipules caducous; leaf blades coriaceous, margins entire; carpels distinct; fruits drupes.	Oemleria