Tithonia rotundifolia

(Miller) S. F. Blake

Contr. Gray Herb. 52: 41. 1917.

Introduced
Basionym: Tagetes rotundifolia Miller Gard. Dict. ed. 8, Tagetes no. 4. 1768
Treatment appears in FNA Volume 21. Treatment on page 139.

Annuals, mostly 100–200 (–400) cm. Leaves: petioles 3–8 cm; blades ± deltate to pentagonal, 7–38 × 7–30 cm, sometimes 3-lobed or 5-lobed, abaxial faces glabrous or soft-pubescent. Peduncles 11–27 cm. Phyllaries 14–21 in (2–) 3 series, lanceolate to linear; outer 17–30 × 4–7.5 mm, apices acute, abaxial faces usually densely puberulent; inner 16–28 × 5–8 mm, apices rounded to acute, abaxial faces usually densely puberulent. Paleae 11.5–15 × 2–3 mm, mucros 2.5–5.5 mm. Ray-florets 8–13; corollas usually orange, sometimes yellow, laminae oval to oblong, 20–33 × 6–17 mm. Disc-florets 60–90. Cypselae 5–7.2n = 34.


Phenology: Flowering Nov.
Habitat: –Jan. Disturbed sites
Elevation: 0–20+ m

Distribution

V21-337-distribution-map.gif

Introduced; Fla., La., Mexico, West Indies, Central America

Discussion

Tithonia rotundifolia is widely cultivated in warm climates and may persist after plantings (e.g., in Asia).

Selected References

None.

Lower Taxa

None.
... more about "Tithonia rotundifolia"
puberulent +, soft-pubescent +  and glabrous +
not tailed +, rounded +  and obtuse +
pale +  and dark +
connate +  and distinct +
rounded;acute +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John C. La Duke +
(Miller) S. F. Blake +
auriculate +  and truncate +
Tagetes rotundifolia +
5-nerved +  and 3-nerved +
7 cm70 mm <br />0.07 m <br /> (38 cm380 mm <br />0.38 m <br />) +
5-lobed;3-lobed;less deltate;pentagonal +
7 cm70 mm <br />0.07 m <br /> (30 cm300 mm <br />0.3 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and orange +
hairy +  and glabrous +
5 +  and 7 +
cuneiform +, biconvex +, 4-angled +, 3-angled +, flattened +  and compressed +
fertile +  and bisexual +
fertile +  and bisexual +
Fla. +, La. +, Mexico +, West Indies +  and Central America +
0–20+ m +
villous +, soft-pubescent +, pilose +, hirsute +  and glabrate +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
–Jan. Disturbed sites +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
campanulate;hemispheric +
20mm;33mm +
oval +  and oblong +
6mm;17mm +
sessile +  and petiolate +
alternate +  and opposite +
triangular +
dentate to pinnatifid or palmatifid +  and entire +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
17mm +  and 30mm +
0.4 cm4 mm <br />0.004 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
2-carpellate +
11.5mm +  and 15mm +
2mm;3mm +
persistent +
coroniform +
11 cm110 mm <br />0.11 m <br /> (27 cm270 mm <br />0.27 m <br />) +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering Nov. +
14 +  and 21 +
Contr. Gray Herb. +
bearing subulate enations +, hairy +  and bristly +
hemispheric;convex +
exalbuminous +
Introduced +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Undefined (tribe Undefined) subtribe Lagasceinae +
Tithonia rotundifolia +
Tithonia +
species +
cylindric +
serrate +  and crenate +
200 cm2,000 mm <br />2 m <br /> (400 cm4,000 mm <br />4 m <br />) +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
500 cm5,000 mm <br />5 m <br /> (700 cm7,000 mm <br />7 m <br />) +
shrub +  and subshrub +