1 | Corolla hidden in basal part of the calyx tube, minute (2-3 mm long). Flowers cleistogamous. Calyx bilabiate; upper lip much broader than the teeth of lower lip, its margins decurrent along the tube |
1' | Corolla exserted from the calyx. Flowers chasmogamous. |
2 | Flowers spirally arranged along the rachis of very dense, 2-15 cm long, simple spikes, 1.5-2 cm long, blue. Bracts during anthesis exceeding the calyx, very conspicuous at the tops of the spikes, brown, acutely acuminate, long-ciliate. Calyx below the apical margin of the short tube with 5 equal, c. 0.5 cm long, at first filiform, afterwards spinous teeth, alternating with 5 minute toothlets, finally closed at the top. Leaves linear-lanceolate, sharply serrate, ± sessile. Cultivated. |
2' | Flowers pale yellow in axillary long-peduncled (6-8 cm), dichotomously branched, straight, many-flowered cincinni. Long-soft-hairy short plant with a soft-woody, prostrate stem less than 10 cm long, and crowded large leaves 15-20 by 10-12 cm; internodes c. 0.5 cm |
2'' | Otherwise. Flowers in verticillasters or in cymes, these with or without well-developed rachises, often combined into spurious heads, spurious spikes, racemes, or panicles. |
3 | Perfect stamens 2; connective usually filiform; if not, then the plant finely stellate-hairy. |
3' | Stamens 4 but only the upper pair perfect; anther-cells divaricate. Calyx 2-lipped. Verticillasters 2-flowered, secund, spaced, in racemes. Corolla almost actinomorphic, hardly 2-lipped. |
3'' | Perfect stamens usually 4; if fewer, then the plant not stellate-hairy, nor the connective long-filiform. |
4 | Filaments short, not toothed; connective transverse to the filament and articulate with it, versatile, long-filiform; its anterior part erect under the upper lip, bearing a single well-developed, often linear perfect anther-cell; its posterior part stuck into the throat, never bearing a perfect anther-cell, but sometimes with effete malformed one. No stellate hairs |
4' | Connective otherwise, the two anther-cells not separated in this way. |
4'' | Otherwise again. |
5 | Leaves rather approximate, subsessile, linear-lanceolate, with recurved, entire margins, rigid, finely stellate-hairy, 1.5-3.5 cm by 1.5-4.5 mm. Cultivated. |
5' | Leaves well-spaced, petioled, not stellate-hairy, rhomboid to ovate, 1-2 by 0.5-1 cm; margin flat, toothed |
6 | Lower verticillasters wide apart, axillary. Corolla red; upper lip entire, densely pilose. Calyx 10-ribbed. Corolla tube slightly shorter than the calyx; 2 anterior stamens longest. Nutlets cuneate-trigonous, truncate, brown. Plant not lemon-scented |
6' | At least the medium and lower leaves deeply palmatifid or pinnatifid. Calyx teeth in normal flowers 5, subequal, rarely 6-7. Stamens covered by the upper lip. Style arms subequal. Disk equal-sided. |
6'' | Leaves much less deeply or not divided. 87a. Verticillasters combined into a terminal head or dense spurious spike. Corolla white; upper lip tinged with red, deeply bipartite. Calyx 13-15-nerved. Corolla tube exceeding the calyx; 2 posterior stamens longest. Nutlets ovoid, black. Plant lemon-scented when bruised. Cultivated. |