Erigeron tenellus

de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 288. 1836.

Common names: Rio Grande fleabane
Treatment appears in FNA Volume 20. Treatment on page 319. Mentioned on page 263.

Annuals, 15–40 cm; slenderly taprooted. Stems initially erect, later ascending to decumbent (herbaceous), proximally spreading to deflexed-villous, closely to loosely strigose on distal 1/3–1/2, eglandular. Leaves basal (often drying translucent, often withering by flowering) and cauline; basal (thin) blades oblanceolate to obovate or spatulate, 10–80 (–140) × 5–34 mm, cauline slightly or gradually reduced to distal 1/3 of stems (bases clasping), margins usually with 1–4 pairs of teeth or lobes, sometimes entire, faces sparsely short-hirsute to hirsuto-villous, eglandular. Heads (1–) 3–10 (–20) in diffuse arrays (branches from distal 2/3). Involucres 2.5–3 × 5–10 mm. Phyllaries in 2–4 series, hirsute to sparsely villous, minutely glandular. Ray-florets 95–160 (–250); corollas white to bluish, 2.5–4 mm, laminae not coiling or reflexing. Disc corollas 1.7–2 mm. Cypselae 0.6–0.8 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 10–13 (–15) bristles. 2n = 18.


Phenology: Flowering Feb–May.
Habitat: Brushlands, palm woods, roadsides, disturbed sites
Elevation: 0–50 m

Distribution

V20-714-distribution-map.gif

Tex., Mexico (Nuevo León), Mexico (Tamaulipas)

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Erigeron tenellus"
not tailed +, rounded +  and obtuse +
distinct +
subequal +
scarious +
usually triangular +  and linear +
usually deltate +  and lanceolate +
paniculiform +, corymbiform +  and loose +
indeterminate +  and determinate +
Guy L. Nesom +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
8 cm80 mm <br />0.08 m <br /> (14 cm140 mm <br />0.14 m <br />) +
1 cm10 mm <br />0.01 m <br /> (8 cm80 mm <br />0.08 m <br />) +
oblanceolate +  and obovate or spatulate +
0.5 cm5 mm <br />0.005 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
decurrent +
linear;lanceolate oblanceolate or spatulate +
rugulose +  and muricate +
Rio Grande fleabane +
not 2-lipped +  and actinomorphic +
white +  and bluish +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
beaked +, 2-ribbed +  and 5-ribbed +
subterete +, oblong +  and oblong-obovoid compressed +
fertile +  and bisexual +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
fertile +  and bisexual +
Tex. +, Mexico (Nuevo León) +  and Mexico (Tamaulipas) +
0–50 m +
strigose +, sparsely short-hirsute +  and hirsuto-villous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Brushlands, palm woods, roadsides, disturbed sites +
disciform +  and discoid +
in loose , corymbiform or paniculiform arrays +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
turbinate;hemispheric +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
not coiling +
petiolate +  and sessile +
cauline +  and basal +
erect;spreading +
deltate +
Not (?) +  and Scarious (?) +
2-carpellate +
Flowering Feb–May. +
3-nerved +  and 1-nerved +
hirsute +  and sparsely villous +
narrowly elliptic +  and linear-lanceolate +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
bearing subulate enations +, hairy +  and bristly +
exalbuminous +
prostrate +  and decumbent +
spreading +, later ascending +  and decumbent +
appendaged +  and truncate +
papillate +  and smooth +
Achaetogeron +  and Trimorpha +
Erigeron tenellus +
Erigeron +
species +
inflated +  and tubular +
90 cm900 mm <br />0.9 m <br /> (100 cm1,000 mm <br />1 m <br />) +
15 cm150 mm <br />0.15 m <br /> (40 cm400 mm <br />0.4 m <br />) +
tree +, shrub +  and subshrub +