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(Last Modified On 4/8/2013)
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(Last Modified On 4/8/2013)
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Genus
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Plumbago L.
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PlaceOfPublication
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Sp. P1. 151. 1753.
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Description
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Herbs or subshrubs, perennial, the stems often scandent or reclining; branches striate, glabrous, sparsely dotted with chalk glands. Leaves alternate, dotted with chalk-secreting glands, sessile and auriculate-amplexicaul, or petiolate, the petiole amplexicaul and sometimes auricled basally, paler below and lepidote-appearing from chalk secretions. Inflorescences racemose or basally paniculate and gradu- ally becoming racemose toward the apex, the axis with mucilage glands or eglandular, pubescent or glabrous. Flowers pedicellate, each subtended by a bract
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Habit
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Herbs or subshrubs
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Description
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and 2 bracteoles, the bract with chalk glands; calyx tubular, the lobes erect, membranous between the ribs, the ribs bearing stalked mucilage glands; corolla salverform, the tube slender, long exserted; stamens hypogynous, only slightly ex- serted, the filaments dilated basally, the anthers linear; styles filiform, usually homostylous, partly connate basally, stigmatic along their inner surfaces. Fruit an achene, utricle, or capsule, membranous, indehiscent or dehiscent circum- cissally or into 5 sometimes apically connate valves, included in the calyx; in Panama the fruit a capsule, the valves separating first near the middle.
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Distribution
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A genus of ca. 20 species in the tropics and subtropics, occasionally reaching into temperate areas. Two species occur in Panama, one native and one an es- cape from cultivation.
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Key
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a. Calyx puberulent, the ribs bearing stalked glands only on the distal portion; petioles auriculate; inflorescence short and dense, the rachis pubescent, eglandular.... .. ...................................................... 1. P. auriculata aa. Calyx glabrous, the ribs bearing stalked glands along the entire length; petioles not auriculate; inflorescence elongate, the rachis glabrous, usually bearing mucilage glands .................................................... 2. P. scandens
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