| 1 |
Calyx shallowly 5-lobed, completely enclosing the fruit |
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1 Heliotropium supinum |
| + |
Calyx 5-partite. Fruit not completely enclosed in the calyx |
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(2) |
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| 2 (1) |
Plants glabrous |
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2 Heliotropium curassavicum |
| + |
Plants vinous to scabrid |
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(3) |
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| 3 (2) |
Stigmas 2, linear-recurved, exserted |
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3 Heliotropium ophioglossum |
| + |
Stigma solitary, minutely 2-fid or capitate, included |
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(4) |
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| 4 (3) |
Stigma capitate, entire |
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4 Heliotropium rariflorum |
| + |
Stigma conical, entire or not |
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(5) |
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| 5 (4) |
Flowers bracteate or at least some |
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(6) |
| + |
Flowers ebracteate |
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(8) |
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| 6 (5) |
Effect semi-shrubby herbs. Leaves linear, 25-50 mm long |
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6 Heliotropium zeylanicum |
| + |
Prostrate to decumbent herbs. Leaves linear lanceolate to elliptic |
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(7) |
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| 7 (6) |
Inflorescence compact, 20-40 mm long. Leaves lanceolate to elliptic. Flowers sessile |
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7 Heliotropium marifolium |
| + |
Inflorescence t lax, 20-100 mm long. Leaves linear-lanceolate (lower down on the inflorescence) |
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5 Heliotropium strigosum |
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| 8 (5) |
Corolla lobes caudate-acuminate |
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20 Heliotropium subulatum |
| + |
Corolla lobes obtuse to ovate or caudate |
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(9) |
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| 9 (8) |
Corolla hairy within |
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(10) |
| + |
Corolla glabrous within |
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(15) |
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| 10 (9) |
Hairs within corolla in two distinct zones |
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8 Heliotropium baluchistanicum |
| + |
Hairs not present in zones |
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(11) |
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| 11 (10) |
Corolla 4-8 mm long |
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(12) |
| + |
Corolla 2-3 mm long |
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(14) |
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| 12 (11) |
Corolla lobes linear, inflexed. Stigma 1.5-1.8 mm
long |
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9 Heliotropium gillianum |
| + |
Corolla lobes ± ovate, obtuse. Stigma 0.7-0.8 mm
long |
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(13) |
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| 13 (12) |
Leaves ovate-lanceolate to lanceolate. Hairs-arising from a swollen base. Inflorescence up to 9 flowered. Corolla uniformly hairy within |
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10 Heliotropium cabulicum |
| + |
Leaves ovate to ovate-oblong. Hairs without a swollen base. Inflorescence up to 20-flowered. Corolla not uniformly hairy within |
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11 Heliotropium biannulatum |
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| 14 (11) |
Leaves elliptic to obovate, 10-25 mm long. Flowers close set. Anthers 0.5-0.6 mm long, narrow, attached c. 0.5 mm from corolla base. Stigma 0.4 mm long |
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12 Heliotropium ovalifolium |
| + |
Leaves ovate, 7-10 mm long. Flowers distantly placed. Anthers c. 1 mm long, ± ovate, attached c. 0.9 mm from corolla base. Stigma 1 mm long |
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13 Heliotropium remotiflorum |
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| 15 (9) |
Plants annual |
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(16) |
| + |
Plants perennial |
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(18) |
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| 16 (15) |
Corolla lobes sublinear, inflexed |
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15 Heliotropium alii |
| + |
Corolla lobes ovate to oblong, obtuse |
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(17) |
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| 17 (16) |
Plants greyish-white. Flowers uniseriate. Calyx deciduous at length |
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16 Heliotropium calcareum |
| + |
Plants green to greenish-grey. Flowers biseriate. Calyx persistent at length |
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17 Heliotropium europaeum |
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| 18 (15) |
Corolla lobes ovate to oblong, obtuse |
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(19) |
| + |
Corolla lobes sublinear, inflexed |
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(21) |
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| 19 (18) |
Leaves lanceolate to linear-lanceolate. Anthers narrow ovate, 0.8-1 mm long |
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(20) |
| + |
Leaves ovate to oblong-ovate. Anthers oblong, 1.8-2 mm long |
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14 Heliotropium ulophyllum |
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| 20 (19) |
Plants erect to suberect, stems up to 5 mm thick at base. Leaf margin crisp-undulate. Nutlet margin not-winged |
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18 Heliotropium crispum |
| + |
Plants decumbent to procumbent; stems up to 15 mm thick at base. Leaf margin revolute or indistinctly undulate. Nutlet margin winged |
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19 Heliotropium bacciferum |
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| 21 (18) |
Anther connectives produced |
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(22) |
| + |
Anther connectives not produced |
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23 Heliotropium dasycarpum |
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| 22 (21) |
Sinuses of corolla lobes without dentitions or lobes. Anthers 1.0 mm long |
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21 Heliotropium aucheri |
| + |
Sinuses of corolla lobes with dentitions or lobes |
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22 Heliotropium lamondiae |
