Argythamnia aphoroides |
Argythamnia serrata |
|
---|---|---|
Hill country silverbush |
Yuma or New Mexico silverbush, Yuma silverbush |
|
Habit | Herbs, perennial, monoecious or dioecious, to 5 dm. | Herbs, annual or perennial, monoecious, to 5 dm. |
Stems | erect to ascending, hairy, hairs malpighiaceous. |
erect or prostrate, usually densely to sparsely hairy, rarely glabrous, hairs malpighiaceous. |
Leaves | stipules deciduous, linear-lanceolate, to 1 mm, margins not glandular; petiole absent; blade elliptic, 1.5–4 × 0.6–2 cm, margins entire, without glands, surfaces hairy, hairs malpighiaceous. |
stipules deciduous, ovate, lanceolate to subulate, 0.5–2.3 mm, margins not glandular; petiole 1–10 mm; blade elliptic to ovate, obovate, or narrowly lanceolate, 1–10.5 × 0.2–3 cm, margins serrate, serrulate, or entire, without glands, surfaces usually densely to sparsely hairy, rarely glabrous, hairs malpighiaceous. |
Inflorescences | unisexual, 3–8 cm; bracts linear-lanceolate, 2–4.5 mm, margins without glands. |
bisexual, 0.4–1.5 cm; bracts ovate to elliptic, 0.8–2 mm, margins without glands. |
Flowers | without pink dye when wetted. |
without pink dye when wetted. |
Staminate flowers | sepals lanceolate to narrowly elliptic, 4–5.5 × 1.1–1.4 mm; petals cuneate-elliptic to cuneate-obovate, 3.3–4 × 1.6–3 mm, free from androphore; nectary glands oblong, 0.4–0.5 × 0.3–0.4 mm, adnate to androphore, glabrous; stamens 10, staminodes 0. |
sepals lanceolate, 0.9–2.5 × 0.4–1.4 mm; petals elliptic to obovate, 1.5–3.5 × 0.6–2 mm, free from androphore; nectary glands elliptic to oblate, 0.3–0.5 × 0.1–0.2 mm, free from androphore, glabrous; stamens 10, staminodes 0 or 3–5, glabrous. |
Pistillate flowers | sepals lanceolate to elliptic, 6–7 × 1.7–3.2 mm, without glands; petals 0 or 5, linear, 0–1.7 mm; nectary glands oblong, 0.5 × 0.7 mm, glabrous; ovary tomentose to lanulose; styles 1.5–3 mm, tomentose; stigmas flattened. |
sepals lanceolate to elliptic, 2.3–6.5 × 0.6–1.6 mm, without glands; petals 5, elliptic, 0.7–3 × 0.4–1.6 mm; nectary glands elliptic, 0.4–0.6 × 0.3–0.4 mm, glabrous; ovary sericeous, strigose, or hispidulous; styles 1–1.8 mm, glabrous; stigmas terete. |
Capsules | 7–9 mm, tomentose to lanulose. |
1.8–4.5 mm, strigose-hispidulous. |
Seeds | 3.7–5 mm, smooth, lightly tuberculate, or striate. |
1.5–2.4 mm, smooth, punctate, striate, or reticulate. |
2n | = 26 (Baja California Sur, Mexico). |
|
Argythamnia aphoroides |
Argythamnia serrata |
|
Phenology | Flowering Jan–Jul. | Flowering year-round. |
Habitat | Bluestem-grama grasslands, oak woodlands, calcareous, often rocky, clay or loam soils. | Desert scrub, sandy, rocky, calcareous soils. |
Elevation | 300–600 m. (1000–2000 ft.) | 0–1600 m. (0–5200 ft.) |
Distribution |
TX |
AZ; CA; NM; NV; TX; Mexico; Central America (Guatemala, Nicaragua)
|
Discussion | Argythamnia aphoroides is restricted to the Edwards Plateau. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Argythamnia serrata is widely distributed and variable; six species have been described to recognize this variation. However, these groups overlap morphologically and geographically, and many specimens cannot be determined with confidence. A broadly defined A. serrata is therefore recognized here. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 174. | FNA vol. 12, p. 178. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Ditaxis aphoroides | Aphora serrata, A. californica, A. dressleriana, A. gracilis, A. micrandra, A. neomexicana, A. serrata var. magdalenae, Ditaxis californica, D. dressleriana, D. gracilis, D. micrandra, D. neomexicana, D. odontophylla, D. serrata, D. serrata var. californica, D. serrata var. magdalenae |
Name authority | Müller Arg.: Linnaea 34: 146. (1865) — (as Argyrothamnia) | (Torrey) Müller Arg.: Linnaea 34: 147. (1865) — (as Argyrothamnia) |
Web links |