Ayenia microphylla

A. Gray

Smithsonian Contr. Knowl. 3(5): 24. 1852.

Common names: Dense or little-leaf ayenia
Treatment appears in FNA Volume 6. Treatment on page 206. Mentioned on page 203.

Shrubs, erect or spreading, 0.2–0.6 m. Stems hairy, hairs stellate, arms appressed. Leaves: petiole 0.4–1.2 cm; blades of proximal leaves orbiculate to suborbiculate, 0.5 × 0.4 cm, distal ovate to narrowly ovate, unlobed, 0.5–2.1 (–3) × 0.4–1.8 (–2) cm, base rounded or obscurely subcordate, margins serrate, stellate-hairy (not ciliate), apex acute to rounded, 3 (–5) -veined from base, surfaces minutely, densely stellate-hairy. Cymes axillary, borne on short-shoots (brachyblasts), 1-flowered or 2-flowered; peduncle to 4 mm. Pedicels to 4 mm. Flowers: sepals caducous, not reflexed at anthesis, ovatelanceolate, 2.5–3.2 mm, densely stellate-pubescent abaxially; petal claws 4 mm, lamina reniform-deltate, 1.4–1.6 × 1.5 mm, base lobed, lobes ± rectangular, margins entire, apex with 2 widely spaced teeth, surfaces glabrous, abaxial appendage absent; androgynophore 0.5–1 mm; stamen filaments present; stigmas scarcely exserted. Capsules subspheric, 4–5 × 4–5 mm, puberulent to densely stellate-pubescent, prickles 0.5 mm. Seeds 3 mm, tuberculate.


Phenology: Flowering and fruiting spring–early fall.
Habitat: Dry limestone, igneous rocky slopes
Elevation: 600–1400 m

Distribution

V6 368-distribution-map.jpg

Ariz., N.Mex., Tex., Mexico (Coahuila)

Discussion

Ayenia microphylla can be distinguished from other Ayenia species in the flora area by the presence of short shoots (brachyblasts) from which leaves and inflorescences emerge. In Texas, the species is known from the trans-Pecos region.

Selected References

None.

Lower Taxa

None.
... more about "Ayenia microphylla"
not +  and appendaged +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
3(-5)-veined +
protruding +
clavate +, cylindric +  and filiform +
Laurence J. Dorr +
A. Gray +
lobed +, subcordate +  and rounded +
0.5 cm5 mm <br />0.005 m <br /> (?) +
orbiculate +  and suborbiculate +
septicidal +, loculicidal +  and dehiscence +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
puberulent +  and densely stellate-pubescent +
subspheric +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
filiform +
Dense or little-leaf ayenia +
2-flowered +  and 1-flowered +
2.1 cm21 mm <br />0.021 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1.8 cm18 mm <br />0.018 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2.1 cm21 mm <br />0.021 m <br />) +
unlobed;ovate;narrowly ovate +
0.4 cm4 mm <br />0.004 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
Ariz. +, N.Mex. +, Tex. +  and Mexico (Coahuila) +
600–1400 m +
sparse;copious +
actinomorphic +
septicidal +, loculicidal +  and dehiscence +
loculicidal +  and septicidal +
subspheric +  and oblate +
Dry limestone, igneous rocky slopes +
1-11-flowered +  and cymose +
terminal +  and axillary +
connate +  and distinct +
1.4mm +  and 1.6mm +
reniform-deltate +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
erose +  and entire +
rectangular +
entire +  and serrate +
stellate-hairy +
(1-)2-many +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
0 cm0 mm <br />0 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
4 cm40 mm <br />0.04 m <br /> (?) +
5 +  and 4 +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
Flowering and fruiting spring–early fall. +
0.5 cm5 mm <br />0.005 m <br /> (?) +
Smithsonian Contr. Knowl. +
septicidal +, loculicidal +  and dehiscence +
tuberculate +
not reflexed +
stellate-pubescent +
rounded +  and cylindric +
3-7-veined +  and unarmed +
glabrous +  and stellate-hairy +
Nephropetalum +
Ayenia microphylla +
species +
spreading +  and erect +