Rosaceae tribe Exochordeae

Exochordeae Schulze-Menz ex Reveal

J. Bot. Res. Inst. Texas 4: 215. 2010.

Treatment appears in FNA Volume 9. Treatment on page 383. Mentioned on page 21, 384.

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

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
Luc Brouillet +
Exochordeae Schulze-Menz ex Reveal +
compound +  and simple +
opposite +  and alternate +
free +, connate +  and distinct +
North America +  and Asia +
not +  and aggregated +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
not +  and aggregated +
crassinucellate +
deciduous +  and persistent +
toothed +, unlobed +  and lobed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
2 +  and 1 +
0 (?) +  and 4 (?) +
free +  and distinct +
5 +  and 4 +
adnate +, free +, connate +  and distinct +
J. Bot. Res. Inst. Texas +
not arillate +
free +  and distinct +
free +  and distinct +
branched +  and simple +
not persistent +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
Rosaceae tribe Exochordeae +
Rosaceae subfam. Amygdaloideae +
inconspicuous +
tree +  and shrub +
17 +, 15 +, 9 +  and 8 +