Montanoa tomentosa Cerv.

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Public Records: 0
Specimens with Barcodes: 8
Species With Barcodes: 1

Kingdom Plantae

Subkingdom Tracheobionta

Superdivision Spermatophyta

Division Magnoliophyta

Class Magnoliopsida

Subclass Asteridae

Order Asterales

Family Asteraceae

Tribe Heliantheae

Genus Montanoa

Subgenus Montanoa

Section Montanoa

Species tomentosa

The species spans a vast portion of Mexico into Central America, but the subspecies have more localized populations. Montanoa tomentosa subsp. tomentosa grows in Central Mexico, subsp. microcephala in Oaxaca and Sierra Madre del Sur, subsp. rosei in Sonora and Sinaloa, Mexico and subsp. xanthiifolia from Jalisco to Costa Rica. (Funk, 1982.)

Much branched shrubs 1-3 m tall. Stems terete, brown, herbaceous parts moderately to densely pubescent, hairs 2 mm long. Leaves highly variable; petioles 1.5-4.0 cm long, with or without auricles and wings, moderately to densely glandular and pubescent, hairs 2 mm long; blades often deltoid or ovate (Figs. 10, 11, 13, 26, 27, 29), 3-20 cm long, 1.5-15.0 cm wide, apex acute to acuminate, margin serrate to irregularly dentate, unlobed to 3-5-lobed, adaxial surface moderately to densely pubescent, hairs pustular, abaxial surface sparsely glandular to densely pubescent, hairs 2 mm long. Peduncles 1.0-3.5 mm long, moderately to densely glandular and pubescent, hairs 0.25-2.0 mm long. Heads erect, 0.3-0.8 cm diam in flower, 0.5-1.2 cm diam in fruit, extremely numerous in dense cymose synflorescences in oppositely and alternately branched compound corymbs. Phyllaries (Fig. 31A, B) 4-6, uniseriate, subequal, ovate-lanceolate, 2.5-5.0 mm long, 1-2 mm wide, green to dark green, apex acute to acuminate, mucronate, margin ciliate, entire, abaxial surface sparsely to densely glandular and pubescent, hairs 0.5-1.5 mm long, adaxial surface glabrous. Ray florets 0-6; corollas cream to white, ligules ovate to obovate to oblanceolate, 3-5(-9.5) mm long, (1.25-)2-4(-5) mm wide, apex truncate to rounded, with or without 1-2 notches and with clusters of round tipped hairs, adaxial surface essentially glabrous, abaxial surface sparsely to moderately glandular, tube (0.5-)1.0-1.5(-2.25) mm long, 0.5 mm diam, glabrous to sparsely pubescent, hairs less than 0.5 mm long. Disc florets (Fig. 31C, D) (3-)8-9(-17); corollas light to deep yellow, tube 1-2 mm long, 0.5-1.0 mm diam, glabrous to sparsely pubescent, throat cylindrical, 1.0-1.25 mm long, 0.5 mm wide, sparsely pubescent, hairs less than 0.5 mm long, lobes 5, 0.5-1.0 mm long, 0.5-0.75 mm wide, apex acute, with clusters of round tipped hairs; stamens with filaments 1.2-3.5 mm long, 0.2 mm wide, anthers not fully exserted from corolla, thecae yellow to brown, 1.25-1.5 mm long, 0.5 mm wide, apical appendages yellow, acute, 0.5-0.6 mm long, 0.5 mm wide, abaxial surface of apical appendages and thecae with or without glands; styles (Fig. 31E, F) yellow, (4.5-)5.5(-7.5) mm long, enlarged at base, stigmatic surfaces yellow to brown, 1 mm long, apical appendages yellow, acute, 0.5-0.6 mm long, 0.5 mm wide, abaxial surface of stigmatic area sometimes glandular. Pales at anthesis more or less pentagonal to triangular (Fig. 31G, H), 2-6 mm long, 1-4 mm wide, light yellow to yellow with dark bands near midrib, apex long-acuminate, light or dark, indurate, margin ciliate, entire, abaxial surface moderately to densely glandular and pubescent, hairs 1-5 mm long, adaxial surface glabrous; pales at fruiting persistent, obtrullate to obtriangular (Fig. 31I, J), 4.5-10.0 mm long, 1-4 mm wide, indurate with inconspicuous parallel veins, stramineous, apex tapering, sometimes recurved and indurate, margin ciliate, entire, abaxial surface moderately to densely glandular and pubescent, hairs 0.5-4.0 mm long, adaxial surface glabrous. Achenes usually only one maturing per head, brown-black, 2.5-3.5 mm long, 1.0-1.5 mm diam, smooth. Chromosome number, n = 19.

Funk, V. A. "The Systematics of Montanoa (Asteraceae, Heliantheae)" in Memoirs of the New York Botanical Garden. Vol. 36. The New York Botanical Garden. Bronx, NY. 1982.