Arnoglossum ovatum

(Walter) H. Robinson
Phytologia 28: 294. 1974.
Endemic
Basionyms: Cacalia ovata Walter Fl. Carol., 196. 1788
Synonyms: Arnoglossum ovatum var. lanceolatum (Nuttall) D. B. Ward C. elliottii Nuttall C. lanceolata (Walter) Nieuwland C. lanceolata var. elliottii (R. M. Harper) Kral & R. K. Godfrey Conophora ovata Rafinesque Mesadenia angustifolia R. M. Harper Mesadenia dentata (Nuttall) Rafinesque Mesadenia elliottii R. M. Harper Mesadenia lanceolata (Walter) Rafinesque Mesadenia lanceolata var. virescens R. M. Harper Mesadenia maxima Schultz-Bipontinus Mesadenia ovata Senecio boscianus Senecio walteri
Treatment appears in FNA Volume 20. Treatment on page 624. Mentioned on page 623.

Plants 50–300 cm (weakly rhizomatous). Stems round. Basal leaves: blades ovate to narrowly lanceolate or lance-linear, to 30+ cm, margins usually entire. Cauline leaves: proximal petiolate, ovate to narrowly lanceolate or lance-linear, margins usually entire; distal sessile, smaller. Involucres 8–10 mm. Phyllaries (± purple-tinged) lance-ovate, midveins not winged (tips acute to acuminate, papillate). Corollas usually white or greenish, rarely purplish, 8–9(–10) mm. Cypselae fusiform or clavate, 4–5 mm (dark brown, 7–8-ribbed); pappi (5–)6–7.5 mm. 2n = 50, 52, 56.


Phenology: Flowering (May–)Aug–Oct(–Dec).
Habitat: Wet, sandy woods, lowlands, savannas, roadsides
Elevation: 0–300 m

Distribution

V20-1400-distribution-map.gif

Ala., Fla., Ga., La., Miss., N.C., S.C., Tex.

Discussion

Arnoglossum ovatum is the most variable species in the genus (as implied by synonymy). Extreme forms (very narrow-leaved, e.g., Cacalia lanceolata form, and broadly ovate-leaved forms) look very distinctive; intergradations occur. Differences could be because of dysploid chromosome races, variances in habitat, or some unknown factors.

Selected References

None.

Lower Taxa

None.

... more about "Arnoglossum ovatum"
Loran C. Anderson +
(Walter) H. Robinson +
Cacalia ovata +
Ala. +, Fla. +, Ga. +, La. +, Miss. +, N.C. +, S.C. +  and Tex. +
0–300 m +
Wet, sandy woods, lowlands, savannas, roadsides +
Flowering (May–)Aug–Oct(–Dec). +
Arnoglossum ovatum var. lanceolatum +, C. elliottii +, C. lanceolata +, C. lanceolata var. elliottii +, Conophora ovata +, Mesadenia angustifolia +, Mesadenia dentata +, Mesadenia elliottii +, Mesadenia lanceolata +, Mesadenia lanceolata var. virescens +, Mesadenia maxima +, Mesadenia ovata +, Senecio boscianus +  and Senecio walteri +
Arnoglossum ovatum +
Arnoglossum +
species +