Ayenia microphylla |
Ayenia filiformis |
|
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dense ayenia, little-leaf ayenia, shrubby ayenia |
trans-Pecos ayenia |
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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 |
AZ; NM; TX; Mexico (Coahuila)
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AZ; NM; TX; Mexico (Chihuahua, Sinaloa, Sonora, Zacatecas)
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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 | ||
Sibling taxa | ||
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) |
Web links |