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(Last Modified On 7/12/2013)
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(Last Modified On 7/12/2013)
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Species
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Lobelia laxiflora H.B.K.
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PlaceOfPublication
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Nov. Gen. Sp. P1. 3: 331. 1819.
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Description
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Straggly shrubs or coarsely suffrutescent perennial herbs (0.2-)0.8-1.5( -3.0) m tall, stems glabrous to densely short-pubescent at least above. Principal leaves with blades glabrous to densely pubescent, subentire to more typically finely and evenly beset with callose-tipped serrations, linear-lanceolate to broadly elliptic or ovate, 4-12(-25) cm long, (0.5-)1.5-3.5(-4.5) cm wide, mostly 3-6(-10) times as long as wide, apically acute to acuminate, basally cuneate or rarely rounded. Inflorescences terminal with (10-) 20-60 flowers axillary to the bracts or the upper reduced leaves, mostly 15-30(-60) cm long. Pedicels 1-10 cm long, stiffly ascendant to loosely spreading, glabrous to somewhat villous, bi- bracteolate medially or to within 3-4 mm of the base, the filiform bracteoles 0.5-1.5 mm long. Flowers 2.7-4.8 cm long,; hypanthium glabrous or pubescent, campanulate or shallowly cup-shaped in flower, becoming broadly hemi- spheric in fruit; calyx lobes (1-)3-4(-6.5) mm long, entire, shortly deltoid, narrowly triangular to linear, glabrous or pubescent; corolla red, orange, or yellowish, externally glabrous to densely short-pubescent, the tube 1.6-2.5 mm long, fenestrate, the upper 2 lobes linear, 1-2 cm long, the lower lobes largely fused into a linear-oblong lip 1.0-1.8 cm long bearing 3 acute teeth 1-3(-10) mm long; filaments glabrous to densely spreading short-pubescent, connate above for about 2/3 their length, (1.8-)2.2-2.7(-3.5) cm long, the anther tube (5-)6-7 (-9) mm long, the 2 shorter anthers apically densely white-tufted with stiff tri- chomes, the 3 longer anthers apically moderately villous-hirsute or occasionally appressed villous throughout. Capsules more than half inferior, 5-10 mm high; seeds ellipsoid or oblong, nearly smooth but with faint longitudinal lines, 0.6-0.8 mm long.
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Distribution
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Lobelia laxiflora ranges from Baja California and southern Arizona south through Mexico and Central America into northwestern South America (Co- lombia).
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Note
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The variety stricta ranges from central Mexico (Jalisco and Michoacann) southward as far as Colombia and is apparently the only variant found south of Guatemala.
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