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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
from FNA
TX
[BONAP county map]
from FNA
AZ; NM; NV
[BONAP county map]
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 Euphorbiaceae > Argythamnia Euphorbiaceae > Argythamnia
Sibling taxa
A. adenophora, A. aphoroides, A. argothamnoides, A. brandegeei, A. claryana, A. cyanophylla, A. humilis, A. lanceolata, A. mercurialina, A. serrata, A. simulans
A. adenophora, A. aphoroides, A. argothamnoides, A. argyraea, A. brandegeei, A. claryana, A. humilis, A. lanceolata, A. mercurialina, A. serrata, A. simulans
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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