Melampodium cinereum

de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 518. 1836.

Synonyms: Melampodium cinereum var. hirtellum Stuessy Melampodium cinereum var. ramosissimum (de Candolle) A. Gray
Treatment appears in FNA Volume 21. Treatment on page 35. Mentioned on page 34.

Perennials or subshrubs, 10–20+ cm. Leaf blades linear-oblong to linear, 10–55 × 1–14 mm, lengths 3–10+ times widths, pinnately lobed, lobes 1–10, ultimate margins entire. Peduncles 1–7 cm. Outer phyllaries 5, connate 1/6–1/3+ their lengths, ovate, 3–7+ mm. Ray florets 7–13; corollas cream-white (sometimes purplish abaxially), laminae oblong-elliptic, 2–8+ × 1–3+ mm. Disc florets 25–50. Fruits 1.3–2.2 mm. 2n = 20, 40.


Phenology: Flowering Jan–Jul.
Habitat: Open sites, sand, gravel, loam, or clay soils
Elevation: 0–300 m

Distribution

V21-64-distribution-map.gif

Tex., Mexico (Coahuila, Nuevo León, Tamaulipas).

Discussion

Along the interface of the distributions of Melampodium cinereum and M. leucanthum, some plants are intermediate for traits used to characterize the two species; perhaps the two should be treated as one.

Plants of Melampodium cinereum with leaf blades linear-oblong and basally strigose with hairs 0.3–0.6 mm have been treated as var. cinereum, plants with leaf blades linear-oblong and basally strigose with hairs 0.6–1.5 mm as var. hirtellum, and plants with leaf blades linear and basally strigose with hairs 0.3–0.6 mm as var. ramosissimum (T. F. Stuessy 1972).

Selected References

None.

Lower Taxa

None.
... more about "Melampodium cinereum"
John L. Strother +
de Candolle +
Tex. +, Mexico (Coahuila +, Nuevo León +  and Tamaulipas). +
0–300 m +
Open sites, sand, gravel, loam, or clay soils +
Flowering Jan–Jul. +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
Melampodium cinereum var. hirtellum +  and Melampodium cinereum var. ramosissimum +
Melampodium cinereum +
Melampodium +
species +