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(Last Modified On 4/2/2013)
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(Last Modified On 4/2/2013)
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Genus
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Heliotropium L.
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PlaceOfPublication
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Sp. P1. 130, 1753.
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Description
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Herbs sometimes suffrutescent, rarely shrubs, ? glabrous to roughly pubes- cent. Leaves alternate, sometimes ? fasciculate, pinnately-veined, small to large. Inflorescences spikes or racemes, scorpioid, solitary, paired, or ternate, or the flowers solitary, bracts present or absent. Flowers perfect, + actinomorphic or weakly zygomorphic, pedicellate or subsessile; calyx of 5 sepals, ? connate basally, persistent or deciduous, the lobes linear or lanceolate; corolla mostly salverform to funnelform, white, yellow or blue, the limb 5-lobed, the lobes ? spreading, the throat without appendages; stamens 5, included, borne on the corolla throat, the filaments short or absent, the anthers linear; ovary 4-loculed, lobed or un- lobed, a glandular ring at the base, the style apical, the stigmas sessile or not, peltate or conic. Fruit lobed or unlobed, dry, separating into 2-4 nutlets at maturity; nutlets 1-2-seeded.
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Habit
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Herbs
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Distribution
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About 200 species in the warmer regions of both hemispheres.
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Note
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Three species are known from Panama, but at least one other, H. lagoense (Warm.) Giirke, which has very distinctive long-pedicellate flowers, has also been reported as occurring there (Johnston, Jour. Arnold Arb. 30: 134, 1949). However, I have not seen material of this species from Panama and therefore have not included it.
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Key
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a. Robust herbs; at least some leaves greater than 4 cm wide; inflorescences > 10 cm long. ................1. H. indicum aa. Decumbent herbs; leaves > 1.5 cm wide; inflorescences less than 9 cm long. b. Plants glabrous; leaves somewhat succulent, usually glaucous.... 2. H. curassavicum bb. Plants pubescent, the hairs white; leaves not succulent nor glaucous.... 3. H. procumbens
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