Flora of North America species comparison

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Arnoglossum ovatum

ovateleaf cacalia
Habit 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.
Corollas

usually white or greenish, rarely purplish, 8–9(–10) mm.
Phyllaries

(± purple-tinged) lance-ovate, midveins not winged (tips acute to acuminate, papillate).
Cypselae

fusiform or clavate, 4–5 mm (dark brown, 7–8-ribbed);

pappi (5–)6–7.5 mm.
2n

= 50, 52, 56.

Arnoglossum ovatum
Phenology Flowering (May–)Aug–Oct(–Dec).
Habitat Wet, sandy woods, lowlands, savannas, roadsides
Elevation 0–300 m (0–1000 ft)
Distribution
from FNA
AL; FL; GA; LA; MS; NC; SC; TX
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 624.
Parent taxa Asteraceae > tribe Senecioneae > Arnoglossum
Sibling taxa
A. album, A. atriplicifolium, A. diversifolium, A. floridanum, A. plantagineum, A. reniforme, A. sulcatum
Synonyms Cacalia ovata, A. 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, Senecio walteri
Name authority (Walter) H. Robinson: Phytologia 28: 294. (1974)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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