Argythamnia argyraea |
Argythamnia cyanophylla |
|
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silky silverbush, silvery wild-Mercury |
bruise leaf, Charleston Mountain silverbush |
|
Habit | Herbs, perennial, dioecious, rarely monoecious, to 3.5 dm. | Herbs, perennial, monoecious, to 2.5 dm. |
Stems | erect, densely hairy, hairs silvery, malpighiaceous. |
erect, sparsely hairy, hairs malpighiaceous. |
Leaves | stipules deciduous, oblanceolate or obovate to ovate, 0.2–0.3 mm, margins not glandular; petiole 1–3 mm; blade elliptic to ovate, 0.9–4 × 0.4–0.8 cm, margins entire, without glands, surfaces densely hairy, hairs silvery, 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, pistillate 0.5–1 cm, flowers solitary, staminate 1–2 cm; bracts ovate to elliptic, 0.4–0.5 mm, margins without glands. |
unisexual or bisexual, to 4 cm; bracts ovate to lanceolate, to 1.5 mm, margins without glands. |
Flowers | usually releasing pink dye when wetted. |
without pink dye when wetted. |
Staminate flowers | sepals linear to lanceolate, 2–5 × 0.3–2 mm; petals linear-lanceolate, 3–5 × 0.5–0.6 mm, free from androphore; nectary glands ovate, 0.1–0.2 × 0.1 mm, free from androphore, glabrous; stamens 10, staminodes 5, punctiform, glabrous. |
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 elliptic, 3–4.3 × 0.8–2 mm, without glands; petals 5, lanceolate to linear, 1.5–2 × 0.3–0.5 mm; nectary glands oblong to linear, 0.8 × 0.5 mm, glabrous; ovary hispidulous; styles 1–1.7 mm, pilose; 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 | 4–5 mm, hairs adpressed, short, silvery. |
3–5.5 mm, with scattered adpressed malpighiaceous hairs. |
Seeds | 2.3–2.5 mm, finely papillate. |
3.5–4 mm, smooth, maculate. |
Argythamnia argyraea |
Argythamnia cyanophylla |
|
Phenology | Flowering Apr–Jul. | Flowering Mar–Jun and Aug–Oct. |
Habitat | Shortgrass grasslands or open shrublands on whitish, clay soils. | Scrub, pinyon-juniper woodlands, limestone-derived, rocky soils, damp zones near lakes. |
Elevation | 100–400 m. (300–1300 ft.) | 2000–2600 m. (6600–8500 ft.) |
Distribution |
TX |
AZ; NM; NV |
Discussion | There are very few collections of Argythamnia argyraea, which is endemic to south Texas in Kinney, La Salle, and Maverick counties. Plants of Argythamnia argyraea are usually dioecious, but William Mahler found that larger plants are occasionally monoecious (J. Poole, pers. comm.). (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. 175. | FNA vol. 12, p. 176. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Ditaxis cyanophylla, D. diversiflora | |
Name authority | Cory: Madroño 8: 92. (1945) | (Wooton & Standley) J. W. Ingram: Bull. Torrey Bot. Club 80: 423. (1953) |
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