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(Last Modified On 8/19/2013)
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(Last Modified On 8/19/2013)
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Genus
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Borreria G. F. W. Meyer
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PlaceOfPublication
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Prim. Fl. Esseq. 79: 1818.
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Note
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TYPE: B. suaveolens G. F. W. Meyer, type conserv.
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Synonym
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Tardavel Adanson, Fam. PI. 2: 145. 1763. TYPE: Rheede, 168. Hortus Indicus Malabaricus 9, tab. 76. (design. Standley 1916) = Borreria articularis (L.f.) F. N. Williams. Borrera G. F. W. Meyer, Prim. Fl. Esseq. 79. 1818. orth. mut. Sprengel, Gen. 1: 93. 1830.
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Description
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Herbs, annual or perennial, rarely suffrutescent. Leaves with the petioles united to the stipules forming a setiferous sheath. Inflorescences capitate, usually sessile, axillary or terminating the stem. Flowers with the calycine lobes 2 or 4, equal or unequal, often with interdental teeth, the corolla reduced, funnelshaped, the lobes 4, the stamens usually attached near the mouth; ovary 2 celled with an ascending ovule in each cell. Fruits capsular, coriaceous or membranaceous, 2-valved, the valves septicidally dehiscent; seeds 1 per cell.
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Habit
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Herbs
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Distribution
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Borreria occurs throughout the warmer parts of the world. It is a genus of about 150 species.
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Reference
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Steyermark, J. 1972. 39. Borreria G. F. W. Meyer. The Botany of the Guayana Highland-Part IX. Mem. New York Bot. Gard. 23: 805-831.
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Key
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a. Plants more than 1 dm tall. b. Inflorescences with heads 1.1-2.0 cm in diam. c. Leaves 0.1-0.25 cm wide or if wider, corolla lobes pilulose within ...... 6. B. suaveolens cc. Leaves 0.6-3.2 cm wide. d. Leaves 2 at a node, corolla lobes pilulose within; stipular sheaths pubescent ...... 2. B. laevis dd. Leaves 5-6(-8) at some of the nodes, corolla lobes not pilulose; stipular sheaths glabrous ...... 1. B. densiflora bb. Inflorescences with heads (0.3-)0.5-1.0 cm wide. e. Inflorescences with heads axillary, or if terminal heads present, these much reduced in diam.; stems villose; leaf blades usually drying yellow green or flushed with red ...... 3. B. latifolia ee. Inflorescences with heads both terminal and axillary, similar in diam.; stems glabrate; leaf blades not drying yellow green or flushed with red. f. Leaves 2 at a node. g. Leaves 0.3-1.0 cm wide; corolla ca. 1 mm long; fruits with one carpel with 2 calycine lobes ...... 4. B. ocimoides gg. Leaves (0.6-)1.0-3.0 cm wide; corolla ca. 2.5 mm long; fruits with one carpel with 3 of the 4 calycine lobes ...... 2. B. laevis ff. Leaves 5-6 at some of the nodes ...... 1. B. densiflora aa. Plants less than 0.6 dm tall. h. Leaves to 6 mm long ...... 5. B. pumilio hh. Leaves 10-25 mm long ...... 4. B. ocimoides
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