Flora of North America species comparison

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Cevallia

stinging serpent, stingleaf serpent
Habit Herbs or subshrubs, perennial; trichomes (1) pointed with surfaces ± smooth, knobby, or notched, (2) retrorsely barbed along shaft and at apex, (3) dendritic, and (4) stinging.
Stems

erect, sometimes becoming decumbent.
Leaves

cauline;

petiole present or absent;

blade ovate-elliptic, lobed, margins entire.
Inflorescences

headlike thyrses;

peduncle to 1 dm.
Pedicels

not elongating in fruit.
Flowers

hypanthium adnate to ovary proximally, free distally;

perianth whorls similar;

sepals white to yellowish abaxially, yellow adaxially, distinct, linear-lanceolate, longer than petals;

petals white to yellowish abaxially, yellow adaxially, distinct, linear-lanceolate, spreading, both surfaces densely hairy;

nectary absent;

stamens 5, included;

filaments monomorphic, dorsiventrally flattened, linear, shorter than anthers;

anthers with distal connective extension;

staminodes absent;

pistil pseudomonomerous, placenta subapical;

stigma ovoid, 3–5-lobed, densely hairy.
Fruits

cypselae, urceolate-ovoid, straight;

sepals and petals persistent.
Seeds

1, ovoid.
x

= 7.

Cevallia
Distribution
from USDA
sw United States; n Mexico
[BONAP county map]
Discussion

Species 1.

In subfam. Gronovioideae, Cevallia is sister to a clade consisting of Fuertesia and Gronovia.

The distinctive stamens, which have inflated, tonguelike extensions beyond the pollen sacs, are unique in the family.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 12, p. 492. Author: Larry Hufford.
Parent taxa Loasaceae
Subordinate taxa
C. sinuata
Name authority Lagasca: Varied. Ci. 2(4): 35. (1805)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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