Argythamnia argyraea


Madroño 8: 92. 1945

Common names: Silky silverbush silvery wild-mercury
EndemicConservation concern
Treatment appears in FNA Volume 12. Treatment on page 175. Mentioned on page 173, 174.
Herbs, perennial, dioecious, rarely monoecious, to 3.5 dm. Stems erect, densely hairy, hairs silvery, 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. 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. Flowers usually releasing 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. 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. Capsules 4–5 mm, hairs adpressed, short, silvery. Seeds 2.3–2.5 mm, finely papillate.

Phenology: Flowering Apr–Jul.
Habitat: Shortgrass grasslands or open shrublands on whitish, clay soils.
Elevation: 100–400 m.


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.).



Lower Taxa

No lower taxa listed.

Facts about "Argythamnia argyraea"
AuthorYocupitzia Ramírez-Amezcua +
AuthorityCory +
Common nameSilky silverbush + and silvery wild-mercury +
DistributionTex. +
Elevation100–400 m. +
HabitatShortgrass grasslands or open shrublands on whitish, clay soils. +
PhenologyFlowering Apr–Jul. +
Publication titleMadroño +
Publication year1945 +
ReferenceNone +
Source xml grained fna xml/V12/V12 46.xml +
Special statusEndemic + and Conservation concern +
SynonymsAphora +, Ditaxis + and Serophyton +
Taxon familyEuphorbiaceae +
Taxon nameArgythamnia argyraea +
Taxon parentArgythamnia +
Taxon rankspecies +
VolumeVolume 12 +