Argythamnia argyraea

Cory

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.

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.).

Selected References

None.

Lower Taxa

None.
... more about "Argythamnia argyraea"
Yocupitzia Ramírez-Amezcua +
0.9 cm9 mm <br />0.009 m <br /> (4 cm40 mm <br />0.04 m <br />) +
elliptic;ovate +
0.4cm;0.8cm +
ovate +  and elliptic +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Silky silverbush +  and silvery wild-mercury +
100–400 m. +
pistillate +  and staminate +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
subtending +
Shortgrass grasslands or open shrublands on whitish, clay soils. +
malpighiaceous +
adpressed +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
persistent +  and deciduous +
palmate +  and pinnate +
crenate +, repand +  and subentire +
0.8 cm8 mm <br />0.008 m <br /> (0.01 cm0.1 mm <br />1.0e-4 m <br />) +
oblong +  and linear +
0.5 cm5 mm <br />0.005 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
extrastaminal +
hispidulous +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
rudimentary +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Apr–Jul. +
3(-4)-carpellate +
papillate +
globose +  and ovoid +
distinct +
3mm (?) +  and 4.3mm (?) +
linear +  and lanceolate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Endemic +  and Conservation concern +
punctiform +
flattened +
? (?) +  and ? (?) +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
connate +  and distinct +
0.1 cm1 mm <br />0.001 m <br /> (?) +  and 0.17 cm1.7 mm <br />0.0017 m <br /> (?) +
Aphora +, Ditaxis +  and Serophyton +
Argythamnia argyraea +
Argythamnia +
species +
monoecious +  and dioecious +