Ayenia pilosa

Cristóbal

Opera Lilloana 4: 185, fig. 65. 1960.

Common names: Dwarf ayenia
Treatment appears in FNA Volume 6. Treatment on page 206. Mentioned on page 204, 207.

Subshrubs, decumbent, 0.1–0.2 (–0.3) m. Stems hairy, hairs simple and retrorse, or simple, fasciculate, and stellate. Leaves: petiole 0.5–1 cm; blades of proximal leaves broadly ovate to orbiculate, 0.5–1.3 × 0.5–1.1 cm, distal ovate to oblong-ovate or oblong-lanceolate, unlobed, 0.5–2 (–3.5) × 0.4–1.4 (–1.7) cm, base cordate, margins serrate to doubly serrate, ciliate with 1+ bristles per tooth, apex acute, 3–5-veined from base, surfaces moderately to sparingly hirsute, hairs usually simple, bifurcate, and fasciculate, sometimes also stellate. Cymes axillary, not borne on short-shoots (brachyblasts), (1 or) 2 or 3-flowered; peduncle 2–3 mm. Pedicels 1.5–2 mm. Flowers: sepals persistent, not reflexed at anthesis, ovate, 2 mm, sparingly stellate-hairy abaxially; petal claws 4 mm, lamina rhombic, 1 × 1 mm, base attenuate on claw, margins entire, apex notched, surfaces sparingly hairy abaxially, hairs simple, multicellular, abaxial appendage cylindric to slightly clavate, 0.5 mm; androgynophore 1.5 mm; stamen filaments present; stigmas slightly exserted. Capsules subspheric, 3–3.5 × 3.5 mm, sparingly stellate-hairy, prickles 0.5 mm. Seeds 2–2.5 mm, sparingly tuberculate.


Phenology: Flowering and fruiting year-round.
Habitat: Edges of thickets
Elevation: 600–1200 m

Distribution

V6 369-distribution-map.jpg

N.Mex., Tex., Mexico (Coahuila), Mexico (San Luis Potosí), Mexico (Tamaulipas)

Discussion

Leaf shape and vestiture are the principal characters used to distinguish Ayenia pilosa from A. filiformis. Where they co-occur in southwestern Texas there are intermediates in which the leaves are oblong-ovate as in A. pilosa but the vestiture is more like that of A. filiformis.

Selected References

None.

Lower Taxa

None.

... more about "Ayenia pilosa"
not +  and appendaged +
1.5 cm15 mm <br />0.015 m <br /> (?) +
protruding +
clavate +, cylindric +  and filiform +
Laurence J. Dorr +
Cristóbal +
attenuate +  and cordate +
0.5 cm5 mm <br />0.005 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
broadly ovate +  and orbiculate +
0.5cm;1.1cm +
septicidal +, loculicidal +  and dehiscence +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
stellate-hairy +
subspheric +
3.5 cm35 mm <br />0.035 m <br /> (?) +
filiform +
Dwarf ayenia +
not 3-flowered +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
1.4 cm14 mm <br />0.014 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
unlobed;ovate;oblong-ovate or oblong-lanceolate +
0.4 cm4 mm <br />0.004 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
N.Mex. +, Tex. +, Mexico (Coahuila) +, Mexico (San Luis Potosí) +  and Mexico (Tamaulipas) +
600–1200 m +
sparse;copious +
actinomorphic +
septicidal +, loculicidal +  and dehiscence +
loculicidal +  and septicidal +
subspheric +  and oblate +
Edges of thickets +
multicellular +  and simple +
bifurcate +
1-11-flowered +  and cymose +
terminal +  and axillary +
connate +  and distinct +
simple +, stipulate +, sessile +, subsessile +  and petiolate +
distichous +  and alternate +
erose +  and entire +
entire +  and serrate +
(1-)2-many +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
4 cm40 mm <br />0.04 m <br /> (?) +
5 +  and 4 +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering and fruiting year-round. +
0.5 cm5 mm <br />0.005 m <br /> (?) +
Opera Lilloana +
septicidal +, loculicidal +  and dehiscence +
tuberculate +
2mm +  and 2.5mm +
persistent +
not reflexed +
stellate-hairy +
2 cm20 mm <br />0.02 m <br /> (?) +
rounded +  and cylindric +
3-7-veined +  and unarmed +
hairy +  and hirsute +
Nephropetalum +
Ayenia pilosa +
species +
decumbent +, ascending +  and erect +