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dense ayenia, little-leaf ayenia, shrubby ayenia

trans-Pecos ayenia

Habit Shrubs, erect or spreading, 0.2–0.6 m. Stems hairy, hairs stellate, arms appressed. Subshrubs, decumbent or erect, 0.2–0.5(–0.9) m. Stems hairy, hairs simple and retrorse or simple and stellate.
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.

petiole 0.4–1(–1.5) cm;

blades of proximal leaves ovate to orbiculate, 0.5–2(–3.2) × 0.2–1(–1.5) cm, distal oblong-ovate to ovate-lanceolate or linear, unlobed, 1–4.3(–7) × 0.2–1(–1.5) cm, base rounded to truncate, margins serrate to doubly serrate or dentate, sometimes ciliate, apex subacute, 3(–5)-veined from base, surfaces usually stellate-puberulent, sometimes glabrescent.

Pedicels

to 4 mm.

2–4(–7) mm.

Flowers

sepals caducous, not reflexed at anthesis, ovate-lanceolate, 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.

sepals persistent, not reflexed at anthesis, ovate-lanceolate, 1–3 mm, stellate-hairy abaxially;

petal claws 2–2.5(–6) mm, lamina subtriangular or rhombic, 1–2.5 × 1–2 mm, base ± attenuate on claw, margins entire, apex notched, surfaces hairy abaxially, hairs simple, multicellular, abaxial appendage filiform to slightly clavate, 0.7 mm;

androgynophore 2–3 mm;

stamen filaments present;

stigmas slightly exserted.

Capsules

subspheric, 4–5 × 4–5 mm, puberulent to densely stellate-pubescent, prickles 0.5 mm.

oblate, 2–4 × 5 mm, densely stellate-hairy, prickles 0.5–1 mm.

Seeds

3 mm, tuberculate.

2–3 mm, tuberculate.

Cymes

axillary, borne on short shoots (brachyblasts), 1- or 2-flowered;

peduncle to 4 mm.

axillary, not borne on short shoots (brachyblasts), 1–3(–11)-flowered;

peduncle 2–4(–7) mm.

Ayenia microphylla

Ayenia filiformis

Phenology Flowering and fruiting spring–early fall. Flowering and fruiting spring–early fall.
Habitat Dry limestone, igneous rocky slopes On limestone and granite soil, steep rocky slopes, canyons, sandy washes
Elevation 600–1400 m (2000–4600 ft) 1000–1500 m (3300–4900 ft)
Distribution
from FNA
AZ; NM; TX; Mexico (Coahuila)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico (Chihuahua, Sinaloa, Sonora, Zacatecas)
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

In Texas, Ayenia filiformis is known from the trans-Pecos region.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 206. FNA vol. 6, p. 205.
Parent taxa Malvaceae > subfam. Byttnerioideae > Ayenia Malvaceae > subfam. Byttnerioideae > Ayenia
Sibling taxa
A. compacta, A. euphrasiifolia, A. filiformis, A. jaliscana, A. limitaris, A. pilosa
A. compacta, A. euphrasiifolia, A. jaliscana, A. limitaris, A. microphylla, A. pilosa
Synonyms A. cuneata, A. reflexa
Name authority A. Gray: Smithsonian Contr. Knowl. 3(5): 24. (1852) S. Watson: Proc. Amer. Acad. Arts 24: 42. (1889)
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