Helianthus laciniatus

A. Gray

Mem. Amer. Acad. Arts, n. s. 4: 84. 1849.

Synonyms: Helianthus crenatus R. C. Jackson Helianthus heiseri R. C. Jackson
Treatment appears in FNA Volume 21. Treatment on page 169. Mentioned on page 144.

Perennials, 50–120 (–200) cm. Stems erect, usually strigose or hispid to glabrate. Leaves cauline; opposite or alternate; sessile; blades (green or grayish, 1-nerved or 3-nerved) lanceolate, 5–9 × 0.5–3.5 cm, bases ± cuneate, margins entire or irregularly toothed to lobed, faces strigose to strumose, glanddotted (adaxial sometimes glaucous). Heads 1–9. Peduncles 4–13 cm. Involucres hemispheric, 10–24 mm diam. Phyllaries 16–21, lanceolate, 6–7.5 × 1.8–2.5 mm (often subequal), (margins ciliate) apices acute, abaxial faces hispidulous or strigose to glabrate, glanddotted. Paleae 7–7.8 mm, entire or 3-toothed (apices obtuse to acute, hispid-ciliate to glabrate). Ray-florets 14–20; laminae ca. 8–11 mm. Disc-florets 40+; corollas 4.8–5.8 mm, lobes reddish; anthers purplish, appendages reddish (style-branches yellow). Cypselae 2.7–3.5 mm, glabrate; pappi of 2 (–3) aristate scales 1.4–2.5 mm. 2n = 34.


Phenology: Flowering summer–fall.
Habitat: Open, dry, alkaline soils
Elevation: 1000–1200 m

Discussion

Helianthus laciniatus reaches the northern extent of its range in New Mexico and Texas; it is relatively common in the Chihuahuan Desert areas of Mexico. It is similar to H. ciliaris; it usually has hairy stems as well as denser leaf indument that includes a greater number of subsessile, glandular hairs.

Selected References

None.

Lower Taxa

None.
... more about "Helianthus laciniatus"
strigose +  and glabrate +
not tailed +, rounded +  and obtuse +
pale +  and dark +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
spiciform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
Edward E. Schilling +
A. Gray +
cuneate +
5 cm50 mm <br />0.05 m <br /> (9 cm90 mm <br />0.09 m <br />) +
lanceolate +
0.5cm;3.5cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
reddish +  and yellow +
0.48 cm4.8 mm <br />0.0048 m <br /> (0.58 cm5.8 mm <br />0.0058 m <br />) +
compressed +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
N.Mex. +, Tex. +  and Mexico +
1000–1200 m +
strumose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, dry, alkaline soils +
in more or less corymbiform , paniculiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (2.4 cm24 mm <br />0.024 m <br />) +
hemispheric +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
alternate +  and opposite +
triangular +
serrate +  and entire +
irregularly toothed +  and lobed +
2-carpellate +
3-toothed;entire +
0.7 cm7 mm <br />0.007 m <br /> (0.78 cm7.8 mm <br />0.0078 m <br />) +
persistent +
coroniform +
4 cm40 mm <br />0.04 m <br /> (13 cm130 mm <br />0.13 m <br />) +
Flowering summer–fall. +
0.6 cm6 mm <br />0.006 m <br /> (0.75 cm7.5 mm <br />0.0075 m <br />) +
16 +  and 21 +
0.18 cm1.8 mm <br />0.0018 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Mem. Amer. Acad. Arts, n. s. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
aristate +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
exalbuminous +
procumbent +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Helianthus crenatus +  and Helianthus heiseri +
Helianthus laciniatus +
Helianthus +
species +
campanulate +
toothed +  and entire +
120 cm1,200 mm <br />1.2 m <br /> (200 cm2,000 mm <br />2 m <br />) +
50 cm500 mm <br />0.5 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
shrub +  and subshrub +