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| 1 |
Shrubs, rarely small trees; leaves papery, thickly papery, or papery; veins on adaxial surface conspicuous. |
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(2) |
| + |
Small trees or shrubs; leaves leathery or subleathery, rarely thickly papery; veins on adaxial surface inconspicuous. |
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(3) |
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| 2 (1) |
Leaves ovate, ovate-rounded, or broadly elliptic, rarely ovate lanceolate; stipules linear or filiform, divided, rarely undivided; secondary and smaller lateral veins of leaves conspicuous. |
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1 Helwingia japonica |
| + |
Leaves narrowly elliptic or oblong lanceolate, rarely ± diamond-shaped; ratio of length to width 3 or greater; stipules often 2(or 3)-divided, rarely undivided; secondary and smaller lateral veins of leaves inconspicuous. |
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2 Helwingia himalaica |
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| 3 (1) |
Leaves linear-lanceolate or lanceolate, 4–15 × 0.4–2 cm, margins sparsely glandular serrate. |
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3 Helwingia chinensis |
| + |
Leaves obovate-oblong, oblong, rarely oblanceolate, larger, 9–15 × 3–5 cm, margins densely glandular serrate. |
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4 Helwingia omeiensis |
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