Gomphostemma, IN

KEY TO THE SPECIES OF GOMPHOSTEMMA IN View in CoL THAILAND

1. Inflorescence terminal, condensed at apex of leafy stem axis............................ 10. G. strobilinum View in CoL

1. Inflorescence axillary or basal with flowers condensed or arranged in verticillasters or short raceme-like flowering shoots....................................... 2

2. Cymes inserted at the lower nodes from which leaves have fallen........................................ 3

2. Cymes inserted at the upper nodes at which leaves are present...................................... 4

3. Stems tomentose with stellate hairs with a very short or 1-celled stalk; corolla tube glabrous inside.. 2. G. curtisii View in CoL

3. Stems densely tomentose with densely dendroid hairs and stellate hairs with a multi-celled stalk; corolla tube usually glabrous inside, occasionally with an annulus of simple hairs inside......................... 8. G. pedunculatum View in CoL

4. Corolla tube with annulus of simple hairs inside.......................................... 6. G. microdon View in CoL

4. Corolla tube glabrous inside...................... 5

5. Corolla throat narrow, not inflated or gradually expanding near the throat; nutlets single..................... 6

5. Corolla throat inflated, tube abruptly expanding near the throat; nutlets 1–4.............................. 7

6. Bracteoles 1–3 mm wide, narrower than the calyx..........................................1. G. crinitum View in CoL

6. Bracteoles 4–7 mm wide, broader than the calyx........................................ 7. G. parviflorum View in CoL

7. Bracteoles prominent, longer than the calyx; stems muchbranched already with densely dendroid hairs and stellate hairs with a multi-celled stalk..... 9. G. phetchaburiense View in CoL

7. Bracteoles less prominent, shorter than the calyx; stems throughout sparsely branching or unbranched with hairs various, rarely with dendroid hairs.................. 8

8. Roots tuber-like; plants not higher than 0.4 m ............................................ 5. G. mastersii View in CoL

8. Roots fibrous, not tuber-like; plants always 0.4–3 m ... 9

9. Sprawling to ascending herb; stems slender, not more than 3 mm diam; internodes of leafy and flowering shoots with curving stem appearing wavy, always twisting.......................................... 3. G. flexuosum

9. Erect herb, clearly standing upright; stems robust, up to 8 mm diam; internodes straight........ 4. G. javanicum View in CoL