Tithonia thurberi
Proc. Amer. Acad. Arts 8: 655. 1873.
Common names: Arizona sunflowerweed
Illustrated
Synonyms: Tithonia palmeri Rose
Treatment appears in FNA Volume 21. Treatment on page 139.
Annuals, 70–200 cm. Leaves: petioles 0–3.3 cm; blades deltate, 7–28 × 5.5–21.5 cm, abaxial faces sparsely hirsute (hairs larger on veins). Peduncles 17–36 cm. Phyllaries 13–16 in 3 series, linear to spatulate; outer 8–15 × 2.5–4.5 mm, apices acute, abaxial faces puberulent; inner 12–15.5 × 3.5–7 mm, apices acute, abaxial faces glabrous. Paleae 11–16.5 × 2–4 mm, mucros 3 mm. Ray-florets 7–10; corollas yellow, laminae oblong, 9–15 × 4–6 mm. Disc-florets 40–60. Cypselae 6–9 mm. 2n = 34.
Phenology: Flowering Aug–Sep.
Habitat: Disturbed areas, canyons, watercourses
Elevation: 900–1000 m
Distribution
Ariz., Mexico (Sonora)
Discussion
Selected References
None.
Lower Taxa
None.
... more about "Tithonia thurberi"
inner +
introrse +
connate +
herbaceous +
acute;acute +
scarious +
absent +
hirsute +
papillate +
corymbiform +
continuous +
deltate +
winged;ribbed;winged;ribbed +
1;15 +
stigmatic +
absent +
Arizona sunflowerweed +
zygomorphic +
yellow +
monomorphic +
dimorphic +
6mm;9mm +
staminate +
straight +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
singly +
discoid +
singly +
indeterminate +
Present +
surrounding +
campanulate;hemispheric +
9mm;15mm +
oblong +
4mm;6mm +
cauline +
triangular +
3 cm30 mm <br />0.03 m <br /> (?) +
2-carpellate +
inferior +
attached +
anatropous +
2mm;4mm +
persistent +
falling +
absent +
coroniform +
tough +
thick +
absent +
connate +
persistent +
distinct +
falling +
unequal +
Proc. Amer. Acad. Arts +
1873 +
neuter +
absent +
sterile +
paleate +
hemispheric;convex +
fibrous +
exalbuminous +
modifed +
Illustrated +
alternate +
branched +
erect +
continuous +
2-branched +
papillate +
Tithonia thurberi +
Tithonia +
species +
cylindric +
equaling +
shorter +
annual +