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(Last Modified On 3/6/2013)
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(Last Modified On 3/6/2013)
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Species
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MACHAERIUM ISADELPHUM (E. Meyer) Standley
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PlaceOfPublication
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Jour. Wash. Acad. Sci. 15: 459. 1.925.
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Synonym
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Drepanocarpus isadelphus E. Meyer, Nov. Act. Acad. Leop.-Carol. 12: 807. 1824. Drepanocarpus microphyllus E. Meyer, loc. cit. 808. 1824. Nissolia aculeata DC., Prodr. 2: 258. 1825. Machaerium angutstifolium Vogel, Linnaea 11: 193. 1837. Machaerium affine Benth., Comment. Legum. Gen.. 34. 1837. Machaerium isadelphum (E. Meyer) Amshoff, Med. Bot. Mus. Herb. Rilksuniv. Utrecht 52: 53. 1939.
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Description
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Shrub, woody liana or tree; branchlets often spirally coiled, armed, the spines subulate, up to 0.4 cm. long, glabrous. Leaves with subsessile leaflets, these up to 80, oblong, 0.5-4.5 (-10) mm. long, 0.2-1.3 (-3) mm. wide, obtuse, mucronulate, the costa plane and subevanescent above, the blade stiff, thinly coriaceous, curled, glabrous to sparsely pilose above, minutely puberulent to pilose beneath; rachises 30-40 cm. long, ferruginous; petioles 0.5-2 cm. long, ferruginous; stipules widely subulate, up to 1 cm. long. Panicles terminal, up to 30 cm. long, the rachis terete, the branches arcuate, up to 3 cm. long, patulous, usually paired and subequal, subtended by reflexed spines (stipules?), the flowers 1.0-15 on the longer branches; bracteoles suborbicular, 1.5-3.5 mm. long, villose, with some trichomes up to 1.7 mm. long, obviously bulbous. Flowers with the hypanthium companulate, about 5.5 mm. long, drying purple, glabrous, the teeth scarcely evident to mammiform, 0.5-0.8 mm. long, obtuse, the upper teeth usually united, truncate, the carinal teeth narrower; vexillum reflexed, suborbicular, 6.5-10 mm. long, glabrous or villosulose; wing petals falcately oblong, 7-8 mm. long, glabrous or villosulose, subdeltoid at the apex, attenuate at the base, the auricle obvious; carinal petals obovate or subreniform, 6-7 mm. long, obtuse, the upper margin straight, the hairs few along the lower margin, the claw strongly eccentric; stamens monadelphous or diadel- phous, the sheath curved, 4-5 mm. long, glabrous, the filaments more than one half the length of the sheath, the anthers about 0.6 mm. long; ovary stipitate for about 3 mm., densely sericeous, the style 1.5-3 mm. long. Fruits with the seminiferous area flat or scarcely turgid, falcately oblong, 1.2-5 cm. long, about 0.8 cm. wide, the wing cultriform, about 5 cm. long.
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Distribution
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Panama and northern South America.
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Specimen
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CANAL ZONE: Barro Colorado Island: Shattuck 21, Woodworth & Vestal 584; Balboa, Standley 25500; Cerro Gordo near Culebra, Standley 26039; Gamboa, Standley 28318, 31922; Las Cruces Trail, between Fort Clayton and Corozal, Standley 29143; Darien Station, Standley 31550. CHIRIQUi: Boquete, Terry & Terry 1651. PANAMA: Punta Paitilla, Standley 26233: Matias Herndndez, Juan Diaz, Standley 31975. VERAGUAS: Santiago, Allen 1080.
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Note
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Macbride (Field Mus. Nat. Hist., Bot. Ser. 13(3): 276. 1943) considers the valid name of this species to be M. aculeatum (DC.) Raddi. Inasmuch as De Candolle (loc. cit. 258. 1825) described this as Nissolia aculeata in 1825, Macbride would seem to err in suggesting that Raddi effected the new combination in 1820, five years before De Candolle described the species. Unfortunately I have been unable to locate a copy of the publication (Mem. Soc. Ital. Sci. Modena 18: 598. 1820) cited by Macbride, in which Raddi presumably effected the new combination. Assuming that Macbride is in error, Drepanocarpus isadelphus and Drepanocarpus microphyllus, both published in 1824, would seem to have priority. Since both species were described in the same publication by E. Meyer (loc. cit. 1824), I have elected to retain the specific name isadelphus, as it occurs on an earlier page than micropihyllus. The flowers are described as pale blue to lavender.
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