Argythamnia aphoroides |
Argythamnia cyanophylla |
|
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Hill country silverbush |
bruise leaf, Charleston Mountain silverbush |
|
Habit | Herbs, perennial, monoecious or dioecious, to 5 dm. | Herbs, perennial, monoecious, to 2.5 dm. |
Stems | erect to ascending, hairy, hairs malpighiaceous. |
erect, sparsely hairy, 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 apparently persistent, punctiform, minute, margins glandular; petiole absent; blade elliptic, obovate, or linear, 1–5 × 0.5–2.2 cm, margins entire, without glands, surfaces sparsely hairy, hairs malpighiaceous. |
Inflorescences | unisexual, 3–8 cm; bracts linear-lanceolate, 2–4.5 mm, margins without glands. |
unisexual or bisexual, to 4 cm; bracts ovate to lanceolate, to 1.5 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, 3.5–7 × 1–1.3 mm; petals spatulate to obovate, 3–5 × 1.5 mm, adnate to androphore; nectary glands elliptic, 0.3 × 0.2 mm, adnate to androphore, glabrous; stamens (7–)10, staminodes 0 or rudimentary. |
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 ovate, 3.5–7 × 1.5–2.2 mm, without glands; petals 5, obovate to spatulate, 2.8–3.5 × 0.7–2.8 mm; nectary glands obovate, 0.5 × 0.7 mm, glabrous; ovary sericeous; styles 1.6–2 mm, glabrous; stigmas flattened. |
Capsules | 7–9 mm, tomentose to lanulose. |
3–5.5 mm, with scattered adpressed malpighiaceous hairs. |
Seeds | 3.7–5 mm, smooth, lightly tuberculate, or striate. |
3.5–4 mm, smooth, maculate. |
Argythamnia aphoroides |
Argythamnia cyanophylla |
|
Phenology | Flowering Jan–Jul. | Flowering Mar–Jun and Aug–Oct. |
Habitat | Bluestem-grama grasslands, oak woodlands, calcareous, often rocky, clay or loam soils. | Scrub, pinyon-juniper woodlands, limestone-derived, rocky soils, damp zones near lakes. |
Elevation | 300–600 m. (1000–2000 ft.) | 2000–2600 m. (6600–8500 ft.) |
Distribution |
TX |
AZ; NM; NV |
Discussion | Argythamnia aphoroides is restricted to the Edwards Plateau. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Argythamnia cyanophylla is found from southern Nevada across northern Arizona to central New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 12, p. 174. | FNA vol. 12, p. 176. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Ditaxis aphoroides | Ditaxis cyanophylla, D. diversiflora |
Name authority | Müller Arg.: Linnaea 34: 146. (1865) — (as Argyrothamnia) | (Wooton & Standley) J. W. Ingram: Bull. Torrey Bot. Club 80: 423. (1953) |
Web links |