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Project Name Data (Last Modified On 3/6/2013)
 

Flora Data (Last Modified On 3/6/2013)
Genus MACHAERIUM Pers.
PlaceOfPublication Syn. P1. 2: 276. 1807.
Description Shrubs, trees or high-climbing woody lianas, the wood yielding orange or red sap. Leaves imparipinnate, the leaflets few to numerous, alternate; stipelles ab- sent; stipules often spinescent. Racemes axillary or terminal, these often numerous, cymoid; bracts usually small; bracteoles usually persistent. Flowers small, often dense, the hypanthium truncate, the teeth very short, usually truncate or obtuse; vexillum broad, usually emarginate; wing and carinal petals coherent distally along the lower margin; stamens 10, monadelphous or diadelphous and often with 2 fascicles of 5 stamens, the anthers small, usually basifixed, dehiscing longitudinally; stipe of the ovary surrounded by a glandular collar, the style slender, the stigma scarcely differentiated. Fruits stipitate, flat, samaroid, the seminiferous area proxi- mal, incrassate, the wing attenuate, reticulate, the seeds variable in shape.
Note A genus of approximately 300 species widely distributed in the tropics of the New World and the Old World. The Panamanian species of Machaerium fall nat- urally into two groups, one with multifoliolate leaves, and the other with few leaflets. Pittier's work on Machaerium of Mexico and Central America (Contr. U.S. Nat. Herb. 20: 467-477. 1922) includes six species which occur in Panama, three of which are retained here. In Panama Machaerium is the largest genus of the Dalbergieae, challenged only by Lonchocarpus H.B.K.
Key a. Fruit with the wing straight or slightly curved. b. Leaves with 20-80 leaflets. c. Leaflets palmately veined - -1. M. CHAMBERSII cc. Leaflets pinnately veined. d. Wing of the fruit relatively thick and not drying red. e. Costa of the leaflets almost invisible above; seminiferous area of the fruit distinctly marginate on the upper margin -2. M. GLABRIPES ee. Costa of the leaflets obvious above; fruits not obviously margin- ate. f. Leaflets 20-25. g. Leaflets glabrous, 0.3-0.6 cm. wide; staminal sheath usually hairy distally -3. M. CIRRHIFERUM gg. Leaflets pubescent, 1-2.5 cm. wide; staminal sheath glabrous -4. M. BIOVULATUM ff. Leaflets 25-80, usually pubescent beneath. g. Unarmed trees; rachis of the leaves up to 8 cm. long; hypanthium densely aurous-puberulent; staminal sheath pubescent -5. M. ARBORESCENS gg. Armed woody vines or trees; rachis of the leaves 4-15 (-30) cm. long; hypanthium glabrous (except few hairs on the teeth); staminal sheath glabrous. h. Wing and carinal petals falcate; free filaments of the stamens as long as or longer than the sheath; style 1.5-3 mm. long - 6. M. ISADELPHUM hh. Wing and carinal petals not falcate; free filaments of the stamens less than half the length of the sheath; style 0.5-1.5 mm. long 7. M. PURPURASCENS dd. Wings of the fruit paper-thin and drying red. e. Leaflets obtuse or rarely rounded at the apex, scarcely pubescent; hypanthium puberulent - 8. M. CAPOTE ee. Leaflets rounded at the apex, densely pubescent; hypanthium glabrescent, except for scattered bulbous trich-omes 9. M. LONGIFOLIUM bb. Leaves with 5- to 16 leaflets. c. Leaflets 5-7, long-acuminate. d. Leaflets elliptic; flowers blue; bracteoles wider than long, not carinate; hypanthium glabrescent (except the teeth); upper margin in the wing petals straight; fruit with the wing up to 3 cm. wide, not conspicuously thickened on the lower margin - 10. M. ARBOREUM dd. Leaflets ovate or oblong, rarely elliptic; flowers white; bracteoles at most as wide as long, carinate; hypanthium minutely puberulent; upper margin of the wing petals oblique; fruit with the wing up to 1.8 cm. wide, the lower margin 1-2 mm. thick -11. M. DARIENSE cc. Leaflets 6-16, not long-acuminate (except in M. pachyphyllum). d. Leaflets coriaceous, long-acuminate; rachis of the le af about 2 mm. wide; flowers about 15 mm. long -12. M. PACHYPHYLLUM dd. Leaflets chartaceous or membranous (subcoriaceous in M. seeman- nfi), obtuse to short-acuminate; rachis of the leaf 0.05-1 mm. wide; flowers about 10 mm. long. e. Leaflets 6-13, oblong, lanceolate or elliptic, obviously acuminate, 0.7-2 (-7) cm. wide; vexillum subcordate at the base, the claw obscure; wing petals narrowly oblong, the blade almost as wide proximally as distally; at least one filament of the stamens pubescent -13. M. SEEMANNII ee. Leaflets 9-11, oblong, obtuse or vaguely acuminate, 2-4 cm. wide; vexillum subcuneate at the base, the claw obvious; wing petals subrotund, the blade much wider distally than proximally; filaments of the stamens glabrous .. 14. M. WOODWORTHII aa. Fruit with the wing very broadly lunate 15. M. LUNATUM
 
 
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