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San Joaquin blazing star

mountain blazing-star, variegated-bract blazingstar

Habit Plants candelabra-form, (8–)20–50(–60) cm. Plants wandlike or candelabra-form, (5–)20–40(–50) cm.
Basal leaves

persisting;

petiole present or absent;

blade lanceolate to linear, margins deeply to shallowly lobed.

persisting;

petiole present or absent;

blade lanceolate to linear, margins usually deeply to shallowly lobed, rarely entire.

Cauline leaves

petiole absent;

blade ovate to linear, to 12 cm, margins deeply lobed to dentate.

petiole present or absent (proximal leaves), absent (distal leaves);

blade lanceolate to linear (proximal leaves), ovate-lanceolate to linear (distal leaves), to 13 cm, margins deeply to shallowly lobed or entire.

Bracts

green, ovate to lanceolate, 6.6–12.8 × 1.9–6.8 mm, width 1/5–2/3 length, not concealing capsule, margins 3–7-lobed.

usually green with prominent white base conspicuously extending outwards from midvein, rarely green, usually obovate, rarely lanceolate, 5.9–9.2 × 1.7–5 mm, width 1/5–2/3 length, not concealing capsule, margins usually 3–7-lobed, lateral lobes usually prominent, rarely entire.

Flowers

sepals 3–13 mm;

petals red to orange proximally, orange to yellow distally, 8–22 mm, apex mucronate, rounded, or retuse;

stamens 20+, 4–11 mm, filaments monomorphic, filiform, unlobed;

styles 5–13 mm.

sepals 1–4;

petals orange proximally, yellow distally, 2–6(–8) mm, apex retuse or rounded;

stamens 20–40, 2–7 mm, filaments monomorphic, filiform, unlobed;

styles 1.5–3.5(–6) mm.

Capsules

clavate, 12–35 × 2–4 mm, axillary curved to 90° at maturity, usually inconspicuously longitudinally ribbed.

cylindric or clavate, 6–17(–20) × 2–3 mm, axillary curved to 45° at maturity, usually inconspicuously longitudinally ribbed.

Seeds

20–40, in 2+ rows distal to mid fruit, tan, dark-mottled or not, usually irregularly polygonal, occasionally triangular prisms proximal to mid fruit, surface tuberculate under 10x magnification; recurved flap over hilum absent;

seed coat cell outer periclinal wall domed, domes on seed edges more than 1/2 as tall as wide at maturity.

15–35, in 2+ rows distal to mid fruit, tan, moderately to densely dark-mottled, usually irregularly polygonal, occasionally triangular prisms proximal to mid fruit, surface tuberculate under 10x magnification; recurved flap over hilum absent;

seed coat cell outer periclinal wall domed, domes on seed edges more than 1/2 as tall as wide at maturity.

2n

= 18.

= 36.

Mentzelia pectinata

Mentzelia montana

Phenology Flowering Mar–May. Flowering Apr–Aug.
Habitat Slopes of sandy or gray-white silty soils, grasslands, oak savannas, uncommonly juniper woodlands. Open, disturbed slopes or flats, grasslands, sagebrush scrub, coniferous forests.
Elevation 200–1400 m. (700–4600 ft.) 600–3400 m. (2000–11200 ft.)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; CO; ID; NM; NV; OR; TX; UT; WA; WY; Mexico (Baja California)
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[BONAP county map]
Discussion

Mentzelia pectinata occurs in Kern, San Luis Obispo, Santa Barbara, and Tulare counties, around the southern rim of the San Joaquin Valley, extending into the Inner Coast Ranges and the southern foothills of the Sierra Nevada. Petal color varies from orange to yellow, and fully fertile artificial hybrids have been obtained between populations representing the extreme phenotypes (J. E. Zavortink 1966). Phylogenetic studies suggest that M. pectinata and M. congesta have hybridized to form several allopolyploid species (J. M. Brokaw and L. Hufford 2010b) despite their current allopatric distributions.

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

Mentzelia montana is widely distributed and, in portions of its range, difficult to distinguish from M. albicaulis. Mentzelia montana is morphologically intermediate to M. albicaulis and M. congesta, but ecologically more similar to M. congesta (J. M. Brokaw 2009). Mentzelia montana generally occurs at higher elevations than M. albicaulis and is best distinguished morphologically from M. albicaulis by capsule and bract characteristics. Capsules of M. montana are usually not longer than 17 millimeters or curved more than 45°, whereas those of M. albicaulis are often longer and more curved. Both species may have bracts with some lobes and whitish base, but only M. montana has populations in which these features are prominent. Sepal and petal lengths, which have sometimes been used to distinguish these species, overlap completely.

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

Source FNA vol. 12, p. 541. FNA vol. 12, p. 539.
Parent taxa Loasaceae > Mentzelia > sect. Trachyphytum Loasaceae > Mentzelia > sect. Trachyphytum
Sibling taxa
M. affinis, M. albescens, M. albicaulis, M. argillicola, M. argillosa, M. aspera, M. asperula, M. candelariae, M. canyonensis, M. chrysantha, M. collomiae, M. congesta, M. conspicua, M. crocea, M. cronquistii, M. decapetala, M. densa, M. desertorum, M. dispersa, M. eremophila, M. filifolia, M. floridana, M. flumensevera, M. goodrichii, M. gracilenta, M. hirsutissima, M. holmgreniorum, M. hualapaiensis, M. humilis, M. integra, M. involucrata, M. inyoensis, M. isolata, M. jonesii, M. laciniata, M. laevicaulis, M. lagarosa, M. leucophylla, M. librina, M. lindheimeri, M. lindleyi, M. longiloba, M. marginata, M. memorabilis, M. mexicana, M. micrantha, M. mollis, M. monoensis, M. montana, M. multicaulis, M. multiflora, M. nitens, M. nuda, M. obscura, M. oligosperma, M. oreophila, M. pachyrhiza, M. packardiae, M. paradoxensis, M. perennis, M. polita, M. procera, M. pterosperma, M. puberula, M. pumila, M. ravenii, M. reflexa, M. reverchonii, M. rhizomata, M. rusbyi, M. saxicola, M. shultziorum, M. sivinskii, M. speciosa, M. springeri, M. strictissima, M. thompsonii, M. tiehmii, M. todiltoensis, M. torreyi, M. tricuspis, M. tridentata, M. uintahensis, M. veatchiana
M. affinis, M. albescens, M. albicaulis, M. argillicola, M. argillosa, M. aspera, M. asperula, M. candelariae, M. canyonensis, M. chrysantha, M. collomiae, M. congesta, M. conspicua, M. crocea, M. cronquistii, M. decapetala, M. densa, M. desertorum, M. dispersa, M. eremophila, M. filifolia, M. floridana, M. flumensevera, M. goodrichii, M. gracilenta, M. hirsutissima, M. holmgreniorum, M. hualapaiensis, M. humilis, M. integra, M. involucrata, M. inyoensis, M. isolata, M. jonesii, M. laciniata, M. laevicaulis, M. lagarosa, M. leucophylla, M. librina, M. lindheimeri, M. lindleyi, M. longiloba, M. marginata, M. memorabilis, M. mexicana, M. micrantha, M. mollis, M. monoensis, M. multicaulis, M. multiflora, M. nitens, M. nuda, M. obscura, M. oligosperma, M. oreophila, M. pachyrhiza, M. packardiae, M. paradoxensis, M. pectinata, M. perennis, M. polita, M. procera, M. pterosperma, M. puberula, M. pumila, M. ravenii, M. reflexa, M. reverchonii, M. rhizomata, M. rusbyi, M. saxicola, M. shultziorum, M. sivinskii, M. speciosa, M. springeri, M. strictissima, M. thompsonii, M. tiehmii, M. todiltoensis, M. torreyi, M. tricuspis, M. tridentata, M. uintahensis, M. veatchiana
Synonyms Acrolasia montana
Name authority Kellogg: Proc. Calif. Acad. Sci. 3: 40, fig. 9. (1863) (Davidson) Davidson: in A. Davidson and G. L. Moxley, Fl. S. Calif., 240. (1923)
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