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Veatch's blazing star, white-stem blazingstar, white-stem stick-leaf

mountain stickleaf, Organ Mountain blazingstar

Habit Plants candelabra-form, (5–)20–50 cm. Plants annual, without caudices or tubers.
Stems

erect, to 25 cm.

Leaves

petiole to 12 mm (proximal leaves), absent (distal leaves);

blade usually ovate to hastate, or smallest distal elliptic or lanceolate, basally lobed or unlobed, to 4.5 × 3.5 cm, base cuneate or obtuse to truncate, margins serrate, apex acute.

Basal leaves

persisting;

petiole present or absent;

blade linear-lanceolate, margins deeply to shallowly lobed.

Cauline leaves

petiole absent;

blade ovate-lanceolate to lanceolate, to 17 cm, margins usually deeply lobed to dentate, rarely entire.

Bracts

usually green with prominent white base usually conspicuously extending outwards from midvein, rarely green, usually ovate, rarely lanceolate, 3.3–6.2 × 1.5–3.2 mm, width 1/4–7/8 length, not concealing capsule, margins usually 3–7-lobed, rarely entire.

Pedicels

(fruiting) 1–3 × 2 mm.

Flowers

sepals 2–5 mm;

petals red to orange proximally, orange to yellow distally, 4–7(–10) mm, apex retuse;

stamens 20+, 3–7 mm, filaments monomorphic, filiform, unlobed;

styles (3–)3.5–6 mm.

petals orange, 5–8 × 3–5 mm, apex cuspidate, hairy abaxially at apex;

stamens 10–20, 5–8 mm, filaments monomorphic, filiform;

style 3–5 mm.

Capsules

clavate, 8–28 × 2–4 mm, axillary curved to 70° at maturity, usually inconspicuously longitudinally ribbed.

subcylindric to clavate, 12–25 × 3–5 mm, base tapering gradually, capsule and pedicel not well-differentiated.

Seeds

15–35, in 2+ rows distal to mid fruit, tan, 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 or equal to 1/2 as tall as wide at maturity.

(7–)8–10(–12) per capsule, pyriform, without transverse folds.

2n

= 54.

= 20, 40.

Mentzelia veatchiana

Mentzelia asperula

Phenology Flowering Mar–Jun. Flowering Aug–Oct.
Habitat Loamy to sandy soils, grasslands, desert scrub, oak-pine woodlands. Rocky limestone or igneous slopes, arroyo bottoms, grasslands, oak woodlands.
Elevation 200–2500 m. (700–8200 ft.) 0–1800 m. (0–5900 ft.)
Distribution
from FNA
AZ; CA; NV; OR
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; n Mexico; c Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Mentzelia veatchiana is the most common and widely distributed hexaploid species in sect. Trachyphytum. It exhibits considerable morphological variation and can be difficult to distinguish from M. montana in northern California. Like the larger-flowered M. pectinata, M. veatchiana has interfertile populations with petal colors ranging from orange to yellow (J. E. Zavortink 1966). When bearing orange petals, M. veatchiana is easily distinguished from other species. Reports of M. veatchiana from Utah are based on specimens treated here as M. montana.

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

Populations consistent with the form and geographic region of the type specimen of Mentzelia asperula (collected in southwestern New Mexico) have been recovered in two clades of sect. Mentzelia. In one clade, M. asperula is closely related to M. isolata; in the second clade, it is closely related to M. gypsophila B. L. Turner of northern Mexico (J. Grissom 2014). The polyphyly of M. asperula likely represents convergence on rapid developmental times and small, self-fertilizing flowers. In southeastern Arizona, M. asperula can be difficult to distinguish from M. isolata; see the discussion of the latter for more information.

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

Source FNA vol. 12, p. 543. FNA vol. 12, p. 528.
Parent taxa Loasaceae > Mentzelia > sect. Trachyphytum Loasaceae > Mentzelia > sect. Mentzelia
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. 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. affinis, M. albescens, M. albicaulis, M. argillicola, M. argillosa, M. aspera, 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. 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 M. albicaulis var. veatchiana
Name authority Kellogg: Proc. Calif. Acad. Sci. 2: 99, fig. 28. (1863) Wooton & Standley: Contr. U.S. Natl. Herb. 16: 148. (1913)
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