(Last Modified On 6/14/2013)
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(Last Modified On 6/14/2013)
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Genus
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Baltimora L.
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PlaceOfPublication
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Mant. P1. 158. 1771.
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Note
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TYPE: B. recta L.
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Synonym
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Scolospermum Less., Linnaea 5: 152, tab. 2, figs. 19-31. 1830. TYPE: S. baltimoroides Less.
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Description
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Erect, annual, taprooted herbs; stems terete, obtuse-angled when dry, yellow- green to purple. Leaves opposite, acuminate, 3-nerved from near the base, the margin serrate to biserrate, petiolate. Inflorescence of axillary and terminal heads in few-flowered racemes or large panicles. Heads radiate, subcylindrical to sub- globose; involucral bracts of unequal length, in 3 series, narrowly ovate, acute- acuminate, the adaxial surface glabrous, the outer bracts strigose, the margins scarious toward base, the inner bracts becoming less strigose and more scarious; receptacle convex; paleas conduplicate, lanceolate, scarious, glabrous, acute, the apical margin ciliate with hairs 0.3 mm long, the midrib weak; ray florets fertile, the ligules yellow, elliptic, apically emarginate, the undersurface strigose on veins with hairs 0.1-0.2 mm long, the tube glabrous, 0.2 mm diam., the stigmatic lobes 2, 1 mm long; disc florets perfect, the corollas yellow, glabrous, exserted above the paleas at anthesis, the throat funnelform, the lobes partially reflexed, narrowly triangular, 0.2 mm wide, pubescent on the upper surface, the anthers black, auriculate-at base, the style filiform, 0.1 mm diam., the stigma yellow, undivided, 0.2 mm diam., the ovary filiform, sterile, 0.2 mm diam., glabrous. Fruits triquetrous, sometimes markedly winged, on sides smooth to tuberculate; pappus a crown of tissue or a collar of short awns. Chromosome number n = 15.
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Habit
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herbs
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Distribution
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Baltimora is a genus of two species distributed throughout Mexico, the West Indies, and South America.
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Note
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Although traditionally placed in the subtribe Melam- podiinae, the strongest affinities of the genus may be with Wedelia and its relatives in the subtribe Helianthinae.
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Reference
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Stuessy, T. F. 1973. Revision of the genus Baltimora (Compositae, Heli- antheae). Fieldiana, Bot. 36: 31-50.
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