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| 1 |
Terminal leaflet broadly triangular, base ± cordate, length ca. 1.3 × width; lateral leaflets obliquely truncate-cordate. |
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15 M. cyclocarpa |
| + |
Terminal leaflet broadly or narrowly ovate or rhombic, base cuneate or rounded, length 1.5-2.5 × width, lateral leaflets obliquely rounded or only outer side with truncate base |
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(2) |
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| 2 (1) |
Mature leaves abaxially with dense pale silky adpressed hairs, lateral veins dark and conspicuously less pubescent |
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(3) |
| + |
Mature leaves glabrous or spreading hairy, or if hairs adpressed then veins ± similarly hairy, not with conspicuously dark lines among pale pubescence |
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(5) |
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| 3 (2) |
Terminal leaflet relatively narrow (length 2-2.5 × width), apex with conspicuous narrow acumen 10-20 mm; leaflet hairs abaxially ca. 1 mm, closely adpressed, pale and fine, giving surface a conspicuously shiny-silvery silky appearance, lateral veins more sharply curved near margin and becoming indistinct or arching and joining; lowest calyx lobe shorter than or equaling tube. |
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5 M. calophylla |
| + |
Terminal leaflet relatively broad (length 1.5-1.75 × width), apex acute or with short broad acumen to 5 mm; leaflet hairs at most half-adpressed and either much shorter, less than 0.5 mm, or coarser, yellowish orange and surface not shiny silky, lateral veins uniformly straight or slightly curved, clearly joining margin; lowest calyx lobe often to twice tube length |
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(4) |
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| 4 (3) |
Abaxial hairs on leaflets ca. 1 mm; lowest calyx lobe 8-10 mm, longer than tube; corolla wing ca. 4 × 1.4 cm, almost as long as keel. |
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17 M. incurvata |
| + |
Abaxial hairs on leaflets less than 0.5 mm; lowest calyx lobe (3-)5-6 mm, slightly shorter or longer than tube; corolla wing 2.5-3.3 × 0.6-0.8 cm, conspicuously shorter than keel. |
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18 M. bracteata |
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| 5 (2) |
Standard and wings with apical 1/4-1/3 of margin pubescent |
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(6) |
| + |
Standard and wings with margin not pubescent or pubescent only in basal 1/3 |
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(11) |
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| 6 (5) |
Flowers 5.5-6.5 cm, standard greenish white, wings and keel reddish or purple; wings 4-5.2(-5.6) cm. |
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3 M. macrocarpa |
| + |
Flowers 7-9 cm, purple, red, and/or whitish; wings 6-7 cm |
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(7) |
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| 7 (6) |
Stipels persistent; corolla entirely purple or standard white |
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(8) |
| + |
Stipels not persistent; corolla purple, white, or bicolored |
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(9) |
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| 8 (7) |
Standard, wings, and keel purple; wing relatively broad (length:width ratio 2.5-3:1). |
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10 M. macrobotrys |
| + |
Standard white, wings and keel purple; wing often relatively narrow. |
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3 M. macrocarpa (large-flowered form) |
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| 9 (7) |
Leaflets abaxially glabrous or very sparsely hairy, often drying pale green; length:width ratio of terminal leaflet (2-)3-4:1; corolla greenish white. |
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1 M. birdwoodiana |
| + |
Leaflets abaxially with abundant to dense often colored hairs, drying brownish green or black; length:width ratio of terminal leaflet usually 1.5-1.75:1; corolla white or partly purple |
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(10) |
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| 10 (9) |
Indumentum of leaflets red-brown; corolla purple with whitish or greenish standard; leaflets often with less than 5 lateral veins on either side. |
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3 M. macrocarpa (large-flowered form) |
| + |
Indumentum of leaflets pale; corolla usually deep purple; leaflets with 5-8 lateral veins on either side. |
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2 M. bodinieri |
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| 11 (5) |
Flowers crowded in upper 2/3 of axis, lower flowerless part of axis with conspicuous bracts and scars; leaflets thickly papery or leathery, markedly discolorous, greenish gray abaxially in dry state and with lateral veins conspicuously stout, dark, prominent, less pubescent than rest of surface, ± straight, running into margin. |
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18 M. bracteata |
| + |
Flowers evenly spaced throughout inflorescence length, or if only in upper 2/3 then lower flowerless part of axis without bracts or scars; leaflets papery or membranous, not markedly discolorous, venation neither conspicuously stout nor less pubescent than surface, running into margin or not |
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(12) |
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| 12 (11) |
Flowers crowded into upper 1/4 of axis, lower pedicels and ultimate peduncles to 2 cm, progressively shorter toward inflorescence apex, inflorescence pseudoumbellate; corolla white, to 4.4 cm; calyx teeth very short, lowest (1-)2-3 mm. |
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6 M. gigantea |
| + |
Flowers well spaced or crowded near apex but pedicels all of similar length, ca. 1 cm or less, ultimate peduncles knoblike or rarely to ca. 0.4 cm, inflorescence racemose; corolla purple or white, often more than 5 cm; calyx teeth mostly long, lowest 5-15 mm (3-4 mm in M. lamellata) |
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(13) |
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| 13 (12) |
Wing of corolla with abundant long adpressed hairs 1-2 mm in upper 2/3 of inner surface; corolla purple or reddish brown |
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(14) |
| + |
Wing of corolla glabrous except for short hairs in claw region; corolla purple or white |
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(15) |
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| 14 (13) |
Flowers 4-4.5 cm; terminal leaflet usually angular, rhombic, lateral veins straight throughout most of length and almost reaching margin. |
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14 M. lamellata |
| + |
Flowers 5-5.5 cm; terminal leaflet rounded in outline, lateral veins curved, more sharply so near margin and becoming indistinct. |
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11 M. hirtipetala |
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| 15 (13) |
Leaflets with lateral veins clearly running into margin; lateral leaflets often very asymmetric, outer half 2-3 × as wide as inner |
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(16) |
| + |
Leaflets with lateral veins curving and becoming indistinct or arching and joining near margin; lateral leaflets markedly asymmetric or not |
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(17) |
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| 16 (15) |
Calyx with lateral teeth ca. 6 × 5 mm, lowest tooth relatively broad, 8-10 × 4-5 mm, keel apex clawlike and convex, shiny on both surfaces in apical ca. 1 cm; leaflets abaxially with dense adpressed pale hairs ca. 1 mm. |
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17 M. incurvata |
| + |
Calyx with lateral teeth 2-4 × 1.5-3 mm, relatively short compared to lowest tooth, lowest tooth narrow, 6-10 × 2-3 mm (ratio of lowest tooth to lateral teeth usually 2-3:1); keel apex less clawlike; leaflets abaxially glabrous or shortly pubescent. |
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16 M. pruriens |
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| 17 (15) |
Keel 4.8-7 cm |
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(18) |
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Keel 3.5-4.8 cm |
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(22) |
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| 18 (17) |
Stipels caducous; wing 2-3 × as long as wide, wing apex ± acute and horny, usually shiny and often pale; keel 6-7 cm; inflorescences arising from old wood; corolla purple. |
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4 M. sempervirens |
| + |
Stipels persistent; wing 4-5 × as long as wide, wing apex not horny, rarely extreme tip slightly pale, usually ± rounded; keel to 5.7 cm; inflorescences on leafy stems; corolla purple or white |
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(19) |
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| 19 (18) |
Wing ca. 2 cm wide; leaflets rather angular in outline, terminal leaflet rhombic-ovate or rhombic-elliptic, narrowing gradually to evenly tapering acumen and relatively broad (length:width ratio ca. 1.5:1); corolla purple. |
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9 M. membranacea |
| + |
Wing to 1.3 cm wide; leaflets with very curved outline, terminal leaflet elliptic or slightly obovate, narrowing abruptly to short broadly rounded acumen and often relatively narrower (length:width ratio (1.5-)2-2.5:1); corolla pink, purple, or white |
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(20) |
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| 20 (19) |
Hairs on inflorescence axis and calyx spreading, very short, 0.1-0.2 mm and almost velvety; corolla usually pink or purple, rarely white, 4.5-4.8 cm; bracts small, (5-)10-17 × (2-)5-7 mm, fairly early deciduous. |
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8 M. revoluta |
| + |
Hairs on inflorescence axis and calyx adpressed, majority at least 0.4 mm, not velvety; corolla white or purple, usually 5-6 cm; at least lower bracts often persistent, large and broad, 20-40 × 10-20 mm |
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(21) |
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| 21 (20) |
Calyx lobes relatively broad, apex broadly acute, lowest ca. 5 mm wide; all bracts of similar form, broadly ovate, (22-)30-40 mm; corolla always white. |
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7 M. interrupta |
| + |
Calyx lobes relatively narrow and long acuminate, lowest 2-3 mm wide; bracts subtending flowers elliptic or obovate, apex broadly rounded, often hooded, 10-20 mm; corolla usually dark purple. |
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12 M. hainanensis |
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| 22 (17) |
Persistent stipels absent; terminal leaflet relatively narrow (length:width ratio (2-)2.5:1), apex with very marked 1-2 cm acumen. |
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5 M. calophylla |
| + |
Persistent stipels present; terminal leaflet usually relatively wide (length:width ratio rarely over 1.75:1), apex shortly, or not at all, acuminate |
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(23) |
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| 23 (22) |
Flowering pedicels 2-4 mm; pedicel and leaflet abaxially, especially on veins, with fine red-brown hairs; outer half of lateral leaflets ca. 1.5 × as wide as inner; corolla purple. |
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13 M. championii |
| + |
Flowering pedicels 8-20 mm; lateral leaflets sometimes more asymmetric, outer half of lateral leaflets ca. 2 × as wide as inner; corolla purple or white |
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(24) |
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| 24 (23) |
Corolla wings relatively wide, ca. 2 cm wide; leaflets rather angular in outline, terminal leaflet rhombic-ovate or rhombic-elliptic, narrowing gradually to evenly tapering acumen and relatively broad (length:width ratio ca. 1.5:1); lateral leaflets often quite asymmetric with ratio of widths of 2 sides ca. 2:1. |
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9 M. membranacea |
| + |
Corolla wings narrow, to 1.3 cm wide; leaflets with very rounded outline, terminal leaflet elliptic or slightly obovate, narrowing abruptly to short wide rounded acumen and often relatively narrower (length:width ratio (1.5-)2-2.5:1); lateral leaflets less asymmetric with ratio of widths of 2 sides ca. 1.5:1 |
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(25) |
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| 25 (24) |
Hairs on inflorescence axis and calyx spreading, 0.1-0.2 mm, indumentum almost velvety; flowers usually pink or purple, rarely white; bracts (5-)10-17 × (2-)5-7 mm, fairly early deciduous. |
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8 M. revoluta |
| + |
Hairs on inflorescence axis and calyx adpressed, majority at least 0.4 mm, indumentum not velvety; flowers purple; at least lower bracts often persistent, 20-40 × 10-20 mm. |
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12 M. hainanensis |
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