1 | Calyx-tube becoming inflated, papery and conspicuous in fruit |
1' | Calyx-tube not becoming inflated, papery or conspicuous in fruit |
2 | Perennials with tough rootstocks |
2' | Annuals |
3 | Inflorescence without a distinct involucre; standard 9-11 mm long |
3' | Inflorescence with a distinct involucre of small bracts; standard 6-7.5 mm long |
4 | Flower heads globose; calyx teeth longer than tube |
4' | Flower heads subglobose, ovate to irregularly cylindrical; calyx teeth not longer than tube |
5 | Inflorescence 2-3 cm diam.; corolla not resupinate; seeds verruculose |
5' | Inflorescence 0.6-1.5 cm diam.; corolla resupinate; seeds smooth |
6 | Fruiting calyx narrowed to apex, subglabrous or thinly hairy, with conspicuous antenna-like calyx-teeth; peduncle equalling or exceeding subtending leaf (rarely shorter); standard 4.5-7 mm long |
6' | Fruiting calyx subglobose, more or less tomentose, calyx-teeth inconspicuous; peduncle shorter than subtending leaf; standard 3.5-4 mm long |
7 | Perennials |
7' | Annuals |
8 | Inflorescences sessile, 2.5-3 cm diam.; corolla rosy-purple; plants erect or sprawling, 30-70(-100) cm high |
8' | Inflorescences long-pedunculate, 1.4-2.5 cm diam.; petals white or tinged pink; plants prostrate, rooting at the nodes |
9 | Inflorescences sessile or subsessile |
9' | Inflorescences distinctly pedunculate |
10 | Inflorescences densely clustered close to the ground; stem scarcely developed, usually subterranean; small tufted plants usually less then 3 cm high |
10' | Inflorescences not clustered close to the ground; stems usually well developed, not subterranean |
11 | Inflorescences terminal (pseudo-terminal) with an involucre of enlarged stipule-bracts |
11' | Inflorescences axillary, without an involucre of enlarged stipule-bracts |
12 | Stipule-bracts suborbicular or broadly ovate; stipules with a short acumen; calyx-teeth about 4 mm long |
12' | Stipule-bracts broadly ovate with a long cuspidate acumen; stipules elongate-acuminate; calyx-teeth 7-8 mm long |
13 | Inflorescence globose or subglobose; plant glabrous or subglabrous, usually very small; calyx-teeth ovate-acuminate, strongly recurved |
13' | Inflorescence ovoid, obovoid or oblong; plants pubescent |
14 | Calyx-teeth subulate-sristate, suberect in flower and fruit; lateral veins of leaflets running straight into margin of leaflet or very little curved; claw of standard free |
14' | Calyx-teeth lanceolate-acuminate, usually recurved in fruit; lateral veins of leaflets curving downwards at apex; claw of standard united with the claws of wings and keel |
15 | Inner flowers of inflorescence sterile, without corollas, accrescent after anthesis; calyx-teeth becoming long and fliform, usually forming a tangled (medusoid) mass concealing the fruits |
15' | Inner flowers of inflorescence fertile, with corollas; calyx-teeth not tangled or medusoid in fruit |
16 | Peduncle lengthening and recurving after anthesis and burying the inconspicuous infructescence |
16' | Peduncle not noticeably accrescent; infructescence conspicuous, not buried |
17 | Calyx covering all or most of ripe pod |
17' | Calyx covering only base to lower third (rarely half) of pod |
18 | Inflorescences terminal (pseudoterminal); fruiting heads often more than 2 cm diam. |
18' | Inflorescences axillary; fruiting heads usually less than 1 cm diam. |
19 | Upper leaflets narrow, lanceolate, linear or narrowly oblong, at least twice as long as wide |
19' | All the leaflets orbicular, obcordate, shortly oblong or obcuneate, not narrow |
20 | Uppermost leaves opposite |
20' | All the leaves alternate |
21 | Inflorescence very large, 2-3 cm (or more) wide; calyx-teeth exceeding corolla |
21' | Inflorescence smaller, less than 2 cm wide; calyx-teeth shorter than corolla |
22 | Standard 8-10 mm long; calyx-tube glabrous or thinly pilose, distinctly nerved |
22' | Standard 5-6 mm long; calyx-tube densely pilose, indistinctly nerved |
23 | Corolla very small, about 2-3 mm long, much shorter than the conspicuous, fliform calyx-teeth |
23' | Corolla 10-13 mm long, usually equalling or exceeding calyx-teeth |
24 | Corolla equalling or almost equalling the sharp-tipped calyx-teeth |
24' | Corolla exceeding the blunt-tipped calyx-teeth |
25 | Uppermost leaves opposite; inflorescence terminal (pseudoterminal) |
25' | All the leaves alternate |
26 | Corolla persistent, becoming dry and scarious; wings divaricate; seed with a minutely verruculose testa |
26' | Corolla deciduous or withering; wings not divaricate; seed with a smooth testa |
27 | Calyx-teeth ovate or oblong, very unequal, strongly accrescent and spreading in fruit |
27' | Calyx-teeth subulate or fliform, subequal, not markedly accrescent |
28 | Corolla about 2-2.5 cm long; stipules of uppermost (opposite) leaves connate for most of their length |
28' | Corolla about 1-1.2 cm long; stipules of uppermost (opposite) leaves connate only at base |
29 | Calyx-tube 20-nerved; corolla usually shorter than calyx-teeth or only slightly exceeding it |
29' | Calyx-tube 10-nerved; corolla distinctly longer than calyx-teeth |
30 | Standard 8-10 mm long; calyx tube glabrous or thinly pilose, distinctly nerved |
30' | Standard 5-6 mm long; calyx-tube densely pilose, indistinctly nerved |
31 | Inflorescence about 3 cm diam., terminal (pseudoterminal); calyx-teeth 12-15 mm long, conspicuous |
31' | Inflorescence much less than 3 cm diam., lateral or axillary; calyx-teeth short, inconspicuous |
32 | Flowers white or pale pink, calyx-tube 10-nerved |
32' | Flowers yellow (rarely mauve, purple or violet), soon becoming dry, brownish and scarious; calyx-tube 5-nerved |
33 | Standard keeled or folded longitudinally over wings and keel; petals yellow |
33' | Standard flattish or concave, not keeled or longitudinally folded over wings and keel |
34 | Corolla 7-10 mm long |
34' | Corolla 3.5-5 mm long |
35 | Petals violet or purple, becoming brownish |
35' | Petals yellow, becoming brown |
36 | Petals at first yellow, later brownish |
36' | Petals at first violet or mauve, later brownish-yellow or brown |