| 1 |
Corolla blue, violet, or purple. |
|
(2) |
| + |
Corolla white. |
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(3) |
| |
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| 2 (1) |
Leaf blade decurrent to petiole, lateral veins 5-7 pairs; cymes solitary; mericarps with longitudinal ribs |
|
10 Heliotropium indicum |
| + |
Leaf blade not decurrent to petiole, lateral veins 7-9 pairs; cymes paniculate or corymbose; mericarps without longitudinal ribs |
|
9 Heliotropium pseudoindicum |
| |
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|
| 3 (1) |
Stigma short conical, not longer than style. |
|
(4) |
| + |
Stigma long conical, longer than style. |
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(6) |
| |
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|
|
| 4 (3) |
Shrubby perennials; flowers sessile; stigma ca. 1/2 as long as style |
|
2 Heliotropium arguzioides |
| + |
Annuals; flowers pedicellate; stigma ca. as long as style. |
|
(5) |
| |
|
|
|
| 5 (4) |
Style glabrous; mericarps narrowly ovate, 3-3.5 mm |
|
8 Heliotropium acutiflorum |
| + |
Style densely white pubescent; mericarps linear-oblong, complanate, ca. 5 mm |
|
7 Heliotropium micranthum |
| |
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|
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| 6 (3) |
Leaf blade elliptic to elliptic-ovate or obovate, 3-6 cm, sparsely strigose; mericarps glabrous or strigose. |
|
(7) |
| + |
Leaf blade narrowly oblong to ovate or linear-lanceolate, 0.3-2 cm, densely strigose; mericarps hairy. |
|
(8) |
| |
|
|
|
| 7 (6) |
Mericarps glabrous, ± distinctly tuberculate; stigma elongated, deeply 2-cleft at apex |
|
5 Heliotropium europaeum |
| + |
Mericarps retrorsely strigose, indistinctly rugose and warty; stigma not 2-cleft at apex |
|
6 Heliotropium lasiocarpum |
| |
|
|
|
| 8 (6) |
Cymes slender, 2-6 cm; flowers sparse, in 1 row |
|
3 Heliotropium strigosum |
| + |
Cymes stout, 0.8-2.5 cm; flowers crowded, in 2 rows. |
|
(9) |
| |
|
|
|
| 9 (8) |
Bracts lanceolate; fruit densely antrorse hirtellous at apex |
|
1 Heliotropium marifolium |
| + |
Bracts elliptic to ovate; fruit appressed pubescent above middle |
|
4 Heliotropium formosanum |
