Caulanthus cooperi

(S. Watson) Payson

Ann. Missouri Bot. Gard. 9: 293. 1923.

Basionym: Thelypodium cooperi S. Watson Proc. Amer. Acad. Arts 12: 246. 1877
Synonyms: Guillenia cooperi (S. Watson) Greene
Treatment appears in FNA Volume 7. Treatment on page 680. Mentioned on page 678.

Annuals; puberulent or glabrous (trichomes simple and subappressed, and 2-rayed). Stems erect to ascending (often flexuous, weak, often tangled with desert shrubs), usually branched distally, 1–8 dm, glabrous or puberulent. Basal leaves rosulate; petiole 0.3–2.5 cm; blade oblanceolate to spatulate, 0.7–6 cm × 2–27 mm, margins usually coarsely dentate or somewhat pinnatifid, rarely entire, (surfaces glabrous). Cauline leaves (median) sessile; blade lanceolate or oblong, 1.5–7.5 cm × 5–20 mm (smaller distally, base amplexicaul to sagittate), margins dentate or entire, (surfaces glabrous). Racemes (lax), without a terminal cluster of sterile flowers. Fruiting pedicels reflexed, 1–4.5 mm, usually glabrous, rarely puberulent. Flowers: sepals erect, (purplish or yellow-green), narrowly lanceolate, 3–6.5 × 0.8–1.5 mm (equal); petals yellow-green to purplish (often with purple veins), 4.5–9 mm, blade 2–3 × 0.7–1.5 mm, not crisped, claw narrowly oblong-oblanceolate, 2.5–7 × 1–1.5 mm; filaments slightly tetradynamous, median pairs 2–4.5 mm, lateral pair 1.5–3.5 mm; anthers oblong, equal, 1.5–2 mm. Fruits usually reflexed, rarely divaricate (often subfalcate), terete, 2–6 cm × 1.5–2.5 mm; valves each with prominent midvein, (glabrous or puberulent); ovules 24–48 per ovary; style 0.2–2.7 mm; stigma slightly 2-lobed. Seeds 1–2 × 1–1.2 mm. 2n = 28.


Phenology: Flowering (Jan-)Feb–Mar.
Habitat: Desert shrubs, woodlands
Elevation: 600-2300 m

Distribution

V7 1166-distribution-map.gif

Ariz., Calif., Nev., Utah, Mexico (Baja California)

Discussion

Caulanthus cooperi is distributed in the Colorado and Mojave deserts in western Arizona, central and southern California, southern Nevada, and southern Utah.

Selected References

None.

Lower Taxa

None.

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

... more about "Caulanthus cooperi"
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Ihsan A. Al-Shehbaz +
(S. Watson) Payson +
Thelypodium cooperi +
appendaged +  and unappendaged +
not +  and auriculate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
pinnatifid +, lobed +, sinuate +  and dentate +
not crisped;oblong;lanceolate;oblanceolate;spatulate +
much smaller +  and reduced +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
urceolate +, campanulate +  and tubular +
branched +  and simple +
well-developed +
distinct +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
oblong-oblanceolate +
well-differentiated +
1mm;1.5mm +
emarginate +  and entire +
incumbent +  and accumbent +
obliquely +  and incumbent +
Ariz. +, Calif. +, Nev. +, Utah +  and Mexico (Baja California) +
600-2300 m +
straight +  and curved +
connate +  and distinct +
lateral +  and median +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
zygomorphic +  and actinomorphic +
latiseptate +  and sessile +
2 cm20 mm <br />0.02 m <br /> (6 cm60 mm <br />0.06 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
Desert shrubs, woodlands +
sessile +, subsessile +  and petiolate +
alternate +, not +  and rosulate +
cauline +  and basal +
connate +  and distinct +
decurrent +
entire +  and dentate +
pinnatifid +
tenuinucellate +, crassinucellate +  and bitegmic +
campylotropous +  and anatropous +
yellow-green +  and purplish +
rudimentary +
crisped +, channeled +, linear +  and oblanceolate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Flowering (Jan-)Feb–Mar. +
trinucleate +  and 3(-11)-colpate +
Ann. Missouri Bot. Gard. +
puberulent +  and glabrous +
stout +  and slender +
0.1 cm1 mm <br />0.001 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
mucilaginous +
margined +  and winged +
aseriate +, uniseriate +  and biseriate +
not +  and mucilaginous +
white +, black +, brown +  and yellow +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
subglobose +, ovoid +, oblong +  and flattened +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
not basally +  and saccate +
persistent +  and caducous +
distinct +
lanceolate +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
reduced +
latiseptate +, schizocarpic +, samaroid +  and lomentaceous +
indehiscent +  and dehiscent +
angustiseptate +, flat +, angled +, terete +, torulose +, not +, segmented +  and nutletlike +
tetradynamous +
unequal +
procumbent +  and decumbent +
erect +  and ascending +
puberulent +  and glabrous +
not +  and capitate +
subsessile +, sessile +  and petiolate +
persistent +
distinct +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
Guillenia cooperi +
Caulanthus cooperi +
Caulanthus +
species +
coiled +, 1-7-veined +  and veined +
pubescent +  and glabrous +
anastomosing +
glabrous +  and puberulent +
perennial +, biennial +  and annual +
subshrub +  and shrub +
aquatics +  and terrestrial +
glabrous +  and pubescent +