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Mojave desert paintbrush, Mojave Indian paintbrush, Mojave paintbrush

Mount Hamilton paintbrush, Mt. Hamilton Indian paintbrush

Habit Herbs, perennial, 2.3–5.3(–6) dm; from a woody caudex; with a taproot. Herbs, perennial, 1.8–4(–5) dm; from a woody caudex; with a taproot.
Stems

several, erect to weakly ascending, often leaning on nearby shrubs, much-branched, often with short, leafy axillary shoots, hairs sparse, spreading, short or long, soft, branched or unbranched, eglandular.

several to many, erect to ascending, unbranched, sometimes branched, hairs spreading, long, soft, mixed with shorter stipitate-glandular ones.

Leaves

gray-green or green to purple to ± deep red, linear or linear-lanceolate, 2–5 cm, not fleshy, margins plane to ± wavy, flat or involute, 3–5(–7)-lobed, apex acuminate to acute;

lobes spreading-ascending, sometimes widely so, narrowly linear, apex acute or obtuse.

green, linear to narrowly or broadly lanceolate, (1–)3–5(–6) cm, not fleshy, margins wavy (obscure on many pressed specimens), involute, usually 0–3(–5)-lobed, apex broadly acute to rounded;

lobes widely spreading, linear to narrowly lanceolate, apex acute to acuminate.

Inflorescences

3–20 × 0.5–1.5 cm;

bracts green throughout, sometimes tinged dull purple, proximal sometimes linear-lanceolate, distal or all bracts oblong, 3–5(–7)-lobed;

lobes spreading to ascending, linear to oblanceolate, short to long, proximal lobes arising near mid length, sometimes wavy-margined, central lobe apex rounded to truncate, lateral ones obtuse to rounded.

2.5–10 × 2–5.5 cm;

bracts proximally greenish, distally red to red-orange, narrowly lanceolate to broadly lanceolate, 3–5-lobed;

lobes spreading, distal, if present, ascending, linear or narrowly oblanceolate to triangular, proximals long, arising below mid blade, distals short, sometimes mere teeth, near apex of central lobe, sometimes wavy-margined, apex obtuse to rounded, sometimes acute.

Corollas

straight, 13–20 mm;

tube 5–7 mm;

beak short-exserted, sometimes shorter than abaxial calyx segments, adaxially yellow, rarely greenish, 7–10 mm;

abaxial lip pale green to yellowish, reduced, 0.5–1.5 mm, 7–17% as long as beak;

teeth reduced to apiculations, pale green to yellowish, 0.5–0.8 mm.

straight to slightly curved, 24–38 mm;

tube 14–21 mm;

beak exserted from calyx, adaxially green, 11–16.5(–18) mm;

abaxial lip green, reduced, visible or not through deep front cleft in calyx, 2 mm, 13% as long as beak;

teeth incurved, green, 1 mm.

Calyces

light green, cream, or light yellow, often appearing white from dense white-woolly pubescence, 10–18 mm;

abaxial clefts 5–6.5 mm, closed by intertwined hairs and appearing 2 mm deep, adaxial 2.2–4.2 mm, abaxial ca. 25% of calyx length, adaxial ca. 20% of calyx length, shallower (or appearing much shallower), than laterals, lateral 4.6–7.5 mm, ca. 50% of calyx length;

lobes: abaxial segments broad, paddle-shaped, 7 mm, inner surface of abaxial segments densely white-woolly, apex rounded to broadly obtuse, adaxial narrowly triangular, 5 mm, apex acute.

whitish with green veins or green, sometimes purple, distally same color as bracts, sometimes with yellowish band below colored apices, 20–26(–29) mm;

abaxial clefts (8–)13–16(–19) mm, adaxial 7–12(–14) mm, clefts 35–50% of calyx length, deeper than laterals, lateral 2–6(–8) mm, 10–30% of calyx length;

lobes linear-lanceolate to lanceolate, apex obtuse to acute.

2n

= 48.

Castilleja plagiotoma

Castilleja dissitiflora

Phenology Flowering Mar–Jul. Flowering Jun–Aug.
Habitat Dry flats, rocky, sandy, or clayey slopes, ridges, sagebrush steppes, chaparral, desert scrub, pinyon woodlands. Sagebrush slopes often rocky, montane to subalpine.
Elevation 200–2500 m. (700–8200 ft.) 1900–3300 m. (6200–10800 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
NV
[WildflowerSearch map]
[BONAP county map]
Discussion

Castilleja plagiotoma is unique in the genus in the structure of its calyces, with the lateral clefts deeper than the median clefts. The relative lengths of the calyx lobes are also unique, with the abaxial lobes exceeding the adaxial lobes by 2–3 mm. The abaxial lobes also bear a dense indument of whitish, branched hairs. The uniformly greenish bracts are uncommon among perennial species of Castilleja. Castilleja plagiotoma is scattered in the western Mojave Desert and the hills adjacent to the southwestern San Joaquin Valley, California. While not of immediate conservation concern, this species is uncommon and increasingly threatened by recreational vehicles, livestock grazing, residential development, and resource extraction.

Castilleja plagiotoma is most often associated with and is likely parasitic on Eriogonum fasciculatum var. polifolium, but it is also often observed with Artemisia tridentata or other species. It is a known larval host plant for the butterfly, Euphydryas editha subsp. erlichii.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Castilleja dissitiflora is endemic to several mountain ranges in central and eastern Nevada, in the upper montane and lower subalpine zones. It has the deep abaxial calyx cleft of C. linariifolia and the stipitate-glandular, wavy-margined leaves of C. applegatei var. pinetorum. Based on morphological data, Holmgren suggested that it is an allopolyploid derived from hybridization of C. applegatei var. pinetorum and C. linariifolia. His proposal is plausible and should be further tested. Castilleja dissitiflora is a tetraploid, while both putative parental species have at least some diploid populations.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 17, p. 646. FNA vol. 17, p. 603.
Parent taxa Orobanchaceae > Castilleja Orobanchaceae > Castilleja
Sibling taxa
C. affinis, C. ambigua, C. angustifolia, C. applegatei, C. aquariensis, C. arachnoidea, C. attenuata, C. brevilobata, C. brevistyla, C. campestris, C. cervina, C. chambersii, C. chlorotica, C. christii, C. chromosa, C. chrymactis, C. chrysantha, C. cinerea, C. citrina, C. coccinea, C. collegiorum, C. covilleana, C. crista-galli, C. cryptantha, C. cusickii, C. densiflora, C. dissitiflora, C. disticha, C. elata, C. elegans, C. elmeri, C. exserta, C. flava, C. foliolosa, C. fraterna, C. genevieveana, C. glandulifera, C. gleasoni, C. gracillima, C. grisea, C. haydenii, C. hispida, C. hololeuca, C. hyperborea, C. indivisa, C. integra, C. kaibabensis, C. kerryana, C. kraliana, C. lacera, C. lanata, C. lasiorhyncha, C. lassenensis, C. latifolia, C. lemmonii, C. leschkeana, C. levisecta, C. linariifolia, C. lindheimeri, C. lineariloba, C. lineata, C. litoralis, C. lutescens, C. martini, C. mendocinensis, C. mexicana, C. miniata, C. minor, C. mogollonica, C. mollis, C. montigena, C. nana, C. nelsonii, C. nervata, C. nivea, C. occidentalis, C. oresbia, C. organorum, C. ornata, C. pallescens, C. pallida, C. parviflora, C. parvula, C. patriotica, C. peckiana, C. peirsonii, C. pilosa, C. praeterita, C. pruinosa, C. puberula, C. pulchella, C. purpurascens, C. purpurea, C. raupii, C. revealii, C. rhexiifolia, C. rigida, C. rubicundula, C. rubida, C. rupicola, C. salsuginosa, C. scabrida, C. schizotricha, C. septentrionalis, C. sessiliflora, C. subinclusa, C. suksdorfii, C. tenuiflora, C. tenuis, C. thompsonii, C. tomentosa, C. uliginosa, C. unalaschcensis, C. victoriae, C. viscidula, C. wightii, C. wootonii, C. xanthotricha
C. affinis, C. ambigua, C. angustifolia, C. applegatei, C. aquariensis, C. arachnoidea, C. attenuata, C. brevilobata, C. brevistyla, C. campestris, C. cervina, C. chambersii, C. chlorotica, C. christii, C. chromosa, C. chrymactis, C. chrysantha, C. cinerea, C. citrina, C. coccinea, C. collegiorum, C. covilleana, C. crista-galli, C. cryptantha, C. cusickii, C. densiflora, C. disticha, C. elata, C. elegans, C. elmeri, C. exserta, C. flava, C. foliolosa, C. fraterna, C. genevieveana, C. glandulifera, C. gleasoni, C. gracillima, C. grisea, C. haydenii, C. hispida, C. hololeuca, C. hyperborea, C. indivisa, C. integra, C. kaibabensis, C. kerryana, C. kraliana, C. lacera, C. lanata, C. lasiorhyncha, C. lassenensis, C. latifolia, C. lemmonii, C. leschkeana, C. levisecta, C. linariifolia, C. lindheimeri, C. lineariloba, C. lineata, C. litoralis, C. lutescens, C. martini, C. mendocinensis, C. mexicana, C. miniata, C. minor, C. mogollonica, C. mollis, C. montigena, C. nana, C. nelsonii, C. nervata, C. nivea, C. occidentalis, C. oresbia, C. organorum, C. ornata, C. pallescens, C. pallida, C. parviflora, C. parvula, C. patriotica, C. peckiana, C. peirsonii, C. pilosa, C. plagiotoma, C. praeterita, C. pruinosa, C. puberula, C. pulchella, C. purpurascens, C. purpurea, C. raupii, C. revealii, C. rhexiifolia, C. rigida, C. rubicundula, C. rubida, C. rupicola, C. salsuginosa, C. scabrida, C. schizotricha, C. septentrionalis, C. sessiliflora, C. subinclusa, C. suksdorfii, C. tenuiflora, C. tenuis, C. thompsonii, C. tomentosa, C. uliginosa, C. unalaschcensis, C. victoriae, C. viscidula, C. wightii, C. wootonii, C. xanthotricha
Name authority A. Gray: Proc. Amer. Acad. Arts 19: 93. (1883) — (as Castilleia) N. H. Holmgren: Mem. New York Bot. Gard. 21(4): 46, figs. 6–8. (1971)
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