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10. Arisaema sect. Pistillata (Engler) Nakai, Bot. Mag. (Tokyo). 43: 525. 1929.
花南星组 hua nan xing zu
Arisaema [unranked] Pistillata Engler, Pflanzenr. 73(IV. 23F): 151. 1920.
Plants with tubers, paradioecious. Phyllotaxy spiro-distichous. Leaves 1 or 2; leaf blade 3-foliolate or pedately multifoliolate. Spadix unisexual; thecae dehiscing by an apical elliptic or oblong slit; appendix erect, slightly exserted from spathe tube, cylindric, base nearly truncate and stipitate, apex obtuse.
About 57 species: E Asia, North America; six species (three endemic) in China.
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| 1 |
Spathe blade cucullate-galeate. |
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61 A. ringens |
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Spathe blade flat, not cucullate-galeate |
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(2) |
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| 2 (1) |
Underground stem obovoid, stoloniferous. |
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59 A. xuanweiense |
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Underground stem a subglobose tuber, not stoloniferous |
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(3) |
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| 3 (2) |
Tuber bluish green outside; leaf blade always 3-foliolate, glaucous abaxially, always entire; infructescence nodding. |
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60 A. lobatum |
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Tuber whitish outside; leaf blade pedate with 5 or more leaflets, or rarely 3-foliolate, usually not glaucous abaxially, occasionally serrate or dentate; infructescence upright |
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(4) |
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| 4 (3) |
Pseudostem much shorter than petioles (except sheath part). |
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62 A. amurense |
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Pseudostem longer than petioles |
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(5) |
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| 5 (4) |
Leaflets usually 5-7; spathe tube funnelform, throat oblique, scarcely recurved. |
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63 A. bockii |
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Leaflets usually 7 or more; spathe tube cylindric, throat horizontal, narrowly recurved. |
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64 A. peninsulae |
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