Castilleja rigida

Eastwood

Proc. Amer. Acad. Arts 44: 575. 1909.

Common names: Rigid paintbrush
Synonyms: Castilleja latebracteata Pennell
Treatment appears in FNA Volume 17. Treatment on page 651. Mentioned on page 579, 652.

Herbs or subshrubs, perennial, 1.4–7.5 dm; from a woody caudex; with a strongly woody taproot or branched, woody roots. Stems few-to-many, erect to basally ascending, sometimes with subtle, curvy zigzags, unbranched, sometimes branched, proximally or with short, leafy axillary shoots, hairs loosely spreading, long, soft, ± wavy, eglandular and shorter stipitate-glandular. Leaves green, linear-oblong to oblong-lanceolate, narrowly lanceolate, or narrowly oblanceolate, 2–5.5 cm, not fleshy, margins plane, involute, 0-lobed, apex acute, distalmost obtuse to rounded. Inflorescences 2–7.5 × 2–3.5 cm; bracts proximally greenish, distally abruptly rose red, bright red, or red-orange, narrowly to broadly oblong-obovate to obovate or ovate-elliptic, 0-lobed; apex rounded to obtuse. Calyces colored as bracts, sometimes with a yellow central band, 20–32 (–36) mm; abaxial and adaxial clefts (5–) 7–14 mm, ca. 40% of calyx length, deeper than laterals, lateral 0–0.5 mm, 0–7% of calyx length; lobes poorly developed, if present, rounded, apex rounded to truncate, sometimes emarginate. Corollas straight or slightly curved, (24–) 28–36 (–42) mm; tube 15–22 mm; beak exserted, adaxially green to yellow-green, (8–) 10–14 mm; abaxial lip dark green, reduced, 0.5–1.5 mm, 7–12% as long as beak; teeth reduced, green to yellowish green, 0.5–1.5 mm.


Phenology: Flowering Mar–Jul(–Nov).
Habitat: Desert scrub, rocky slopes, ledges, ridges, flats, swales, roadsides, commonly with Agave lechuguilla.
Elevation: 300–1500 m.

Distribution

Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Nuevo León), Mexico (Zacatecas)

Discussion

Castilleja rigida is endemic to desert scrub on limestone deposits in the Chihuahuan Desert region and the adjacent western edge of the Edwards Plateau. It is almost always closely associated with, and most likely parasitic on, Agave lechuguilla. The majority of its range is in the Mexican states of Chihuahua, east of the Sierra Madre Occidental, as well as in Coahuila and Nuevo León, where it is a characteristic component of the regional flora, but also extends into a few counties in southwestern Texas. It is sometimes confused with the similar species, C. nervata, which is widespread in the sierras of western Mexico and is known from a single extant population in the western Chiricahua Mountains of southeastern Arizona. Castilleja nervata and C. rigida are largely parapatric in Mexico.

Selected References

None.

Lower Taxa

None.

... more about "Castilleja rigida"
0.5 cm5 mm <br />0.005 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
J. Mark Egger +, Peter F. Zika +, Barbara L. Wilson +, Richard E. Brainerd +  and Nick Otting +
Eastwood +
0.8 cm8 mm <br />0.008 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
not +, leathery +  and fleshy +
red-orange;bright red;red-orange;bright red;rose red;greenish +
0-lobed +, oblong-obovate +  and obovate or ovate-elliptic +
3.2 cm32 mm <br />0.032 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
2-lobed +, lobed +  and tubular +
2 cm20 mm <br />0.02 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
taprooted;fibrous-rooted or rhizomatous +
fleshy +  and woody +
Rigid paintbrush +
3.6 cm36 mm <br />0.036 m <br /> (4.2 cm42 mm <br />0.042 m <br />) +
purple +, pink +, red +, orange +, yellow +, white +, green +  and pale greenish +
curved +  and straight +
2.8 cm28 mm <br />0.028 m <br /> (3.6 cm36 mm <br />0.036 m <br />) +
obtuse +  and rounded +
Tex. +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (Nuevo León) +  and Mexico (Zacatecas) +
300–1500 m. +
spreading-hairy +  and glabrous +
2 +  and 1 +
indehiscent +, septicidal +, loculicidal +  and dehiscence +
Desert scrub, rocky slopes, ledges, ridges, flats, swales, roadsides, commonly with Agave lechuguilla. +
stipitate-glandular +
axillary +  and terminal +
spiral +, whorled +, alternate +  and opposite +
deciduous +
basal +  and cauline +
linear-oblong;oblong-lanceolate narrowly lanceolate or narrowly oblanceolate +
2 cm20 mm <br />0.02 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
not fleshy +
3 +, 2 +  and 4 +
rounded +
subequal +
0-lobed +  and plane +
tenuinucellate +  and unitegmic +
campylotropous-like +
Flowering Mar–Jul(–Nov). +
Proc. Amer. Acad. Arts +
20 +  and 100 +
trapezoidal +, oblong-ovoid +, pyramidal +  and ovoid +
non-secund +  and secund +
elongate +
subequal +
branched +  and unbranched +
sprawling +  and prostrate +
aerial +  and subterranean +
erect +  and basally ascending +
not fleshy +
2-lobed +  and entire +
Castilleja latebracteata +
Castilleja rigida +
Castilleja +
species +
green +  and yellowish green +
shallow;deep +
reduced +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (2.2 cm22 mm <br />0.022 m <br />) +
subshrub +  and herb +