Cevallia sinuata

Lagasca

Varied. Ci. 2(4): 36. 1805.

Illustrated
Treatment appears in FNA Volume 12. Treatment on page 493.

Plants to 6 dm. Leaves: petiole 0–3 [–8] mm; blade to 6 × 3 cm, pinnately lobed ± 1/2 to midrib, base usually oblique, acute to obtuse, apex acute with rounded tip; midvein and secondary-veins prominent. Flowers: perianth densely covered with long, pointed hairs; sepals 8–9 mm; petals 6–8 mm; stamen filaments 1 mm. 2n = 14, 26.


Phenology: Flowering Apr–Oct.
Habitat: Gypsum and limestone hills, gravelly flats, open desert scrub, Tamaulipan thorn scrub, grasslands.
Elevation: 130–2000 m.

Distribution

V12 609-distribution-map.jpg

Ariz., N.Mex., Okla., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Zacatecas)

Discussion

The small flowers of Cevallia sinuata have an architecture that promotes deposition of self-pollen on the densely hairy stigma. The absence of a nectary in the flowers may reflect selection for self-pollination or for a pollen-flower pollination syndrome (a so-called pollen flower mimic in the sense of S. Vogel 1978) that possibly involves secondary pollen presentation on the stigma. Various insects, especially bees but also butterflies, have been observed to visit the flowers (W. S. Davis and H. J. Thompson 1967; A. M. Powell et al. 1977). The flowers undoubtedly self-pollinate, but it is unclear whether they self-fertilize or may be self-incompatible.

A. M. Powell et al. (1977) noted that populations of n = 7 and n = 13 cytotypes can be found, and that the latter have a larger geographic distribution and wider ecological tolerance compared to the former. They hypothesized that n = 13 populations were derived via polyploidization followed by aneuploidy.

Selected References

None.

Lower Taxa

None.

"not elongating" is not a number."dm" is not declared as a valid unit of measurement for this property.

... more about "Cevallia sinuata"
monomorphic +
flattened +
Larry Hufford +
Lagasca +
acute +  and obtuse +
0 cm0 mm <br />0 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0 cm0 mm <br />0 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Ariz. +, N.Mex. +, Okla. +, Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +  and Mexico (Zacatecas) +
130–2000 m. +
urceolate-ovoid +
Gypsum and limestone hills, gravelly flats, open desert scrub, Tamaulipan thorn scrub, grasslands. +
pointed +
free +  and adnate +
crenate +  and dentate +
apical +, subapical +  and inferior +
yellow +, white +  and yellowish abaxially +
persistent +
distinct +
linear-lanceolate +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Apr–Oct. +
pseudomonomerous +
Varied. Ci. +
yellow;white;yellowish abaxially +
persistent +
distinct +
linear-lanceolate +
0.8 cm8 mm <br />0.008 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
Illustrated +
1 cm10 mm <br />0.01 m <br /> (?) +
adnate +, free +  and distinct +
3-5-lobed +  and ovoid +
Cevallia sinuata +
Cevallia +
species +
headlike +
rounded +
notched +, knobby +  and pointed +