Chylismia sect. Lignothera

(P. H. Raven) W. L. Wagner & Hoch

Syst. Bot. Monogr. 83: 136. 2007.

Basionym: Oenothera sect. Lignothera P. H. Raven Univ. Calif. Publ. Bot. 34: 76. 1962
Synonyms: Camissonia sect. Lignothera (P. H. Raven) P. H. Raven
Treatment appears in FNA Volume 10.

Herbs annual or perennial. Leaves cauline; blade unlobed, cordate-orbicular or deltate. Flowers opening at sunset; floral-tube 4.5–40 mm; petals yellow, without dots or flecks, fading brick-red or orange; pollen shed in tetrads.

Distribution

sw United States, nw Mexico

Discussion

Species 2 (2 in the flora).

Section Lignothera consists of two diploid (2n = 14) species (four taxa) that occur on rocky slopes and in washes in the Mojave and western Sonoran Deserts. Chylismia arenaria occurs from southeastern California into adjacent southwestern Arizona and barely to northern Sonora, Mexico; the more widespread C. cardiophylla occurs in that same region but also reaches to south-central Baja California, Mexico, farther east in Arizona, and north to the western and southern margins of Death Valley in Inyo County, California. P. H. Raven (1962) considered this group to be an early evolutionary offshoot within Camissonia. He revised his position (Raven 1969) to regard the late afternoon-opening flowers, pollen shed in tetrads, and semi-woody habit as specializations within Onagreae and in Camissonia, and, consequently, to regard sect. Lignothera as a derivative of sect. Chylismia and its long floral tubes an adaptation for hawkmoth pollination.

Selected References

None.

Key

1 Floral tubes 4.5–14 mm; racemes congested; sepals 3–9 mm. Chylismia cardiophylla
1 Floral tubes 18–40 mm; racemes open; sepals 8–15 mm. Chylismia arenaria
Warren L. Wagner +
(P. H. Raven) W. L. Wagner & Hoch +
Oenothera sect. Lignothera +
indehiscent +  and loculicidal +
lobed +, toothed +  and entire +
deltate +, cordate-orbicular +  and unlobed +
reduced +
reflexed +  and erect +
curved +  and straight +
oblong-cylindrical +, clavate +  and subterete +
sw United States +  and nw Mexico +
basifixed +  and versatile +
0.45 cm4.5 mm <br />0.0045 m <br /> (4 cm40 mm <br />0.04 m <br />) +
actinomorphic +
curved +  and straight +
loculicidal +
oblong-cylindrical +, clavate +  and subterete +
perennial +  and annual +
unlobed +  and lobed +
deciduous +
reduced +
entire +, serrulate +, dentate +  and serrate +
membranous +
numerous +  and 1 +
orange +, fading brick-red +  and yellow +
Syst. Bot. Monogr. +
well-developed +
basal +  and cauline +
clavate +  and globose +
7 +  and numerous +
lenticular +  and narrowly ovoid +
purple +, pink +, red +  and green +
deciduous +
parenchymatous +
parietal +, axile +  and placentation +
1 +, 4 +  and 2 +
subequal +
aquatic +, amphibious +  and terrestrial +
2 times as many or as many as sepals +
prostrate +  and decumbent +
conical-peltate +
capitate +  and entire +
long-petiolate +
intrapetiolar +
aquatic +, amphibious +  and terrestrial +
non-papillate +
Camissonia sect. Lignothera +
Chylismia sect. Lignothera +
Chylismia +
section +
3(-5)-aperturate +
smooth +  and erose +
papillate +