Arnoglossum ovatum

(Walter) H. Robinson

Phytologia 28: 294. 1974

Synonyms: Arnoglossum ovatum var. lanceolatum (Nuttall) D. B. WardC. elliottii NuttallC. lanceolata (Walter) NieuwlandC. lanceolata var. elliottii (R. M. Harper) Kral & R. K. GodfreyConophora ovata RafinesqueMesadenia angustifolia R. M. HarperMesadenia dentata (Nuttall) RafinesqueMesadenia elliottii R. M. HarperMesadenia lanceolata (Walter) RafinesqueMesadenia lanceolata var. virescens R. M. HarperMesadenia maxima Schultz-BipontinusMesadenia ovata unknownSenecio boscianus unknownSenecio walteri unknown
Basionyms: Cacalia ovata Walter
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.

References

None.

Lower Taxa

No lower taxa listed.