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7. Arisaema sect. Tortuosa (Engler) H. Hara, Bull. Univ. Mus. Univ. Tokyo. 2: 344. 1971.
曲序组 qu xu zu
Arisaema [unranked] Tortuosa Engler, Pflanzenr. 73(IV. 23F): 185. 1920; Flagellarisaema Nakai.
Underground stems tuberous. Phyllotaxy quincuncial. Leaves 1 or 2(or 3); leaf blade 3-foliolate or pedate. Spathe limb erect or incurved, usually ovate. Spadix: thecae dehiscing by apical lunate slit or by pore; appendix elongate, sigmoid, tortuous, base gradually attenuate and sessile, without neuter flowers.
About 18 species: E Asia, North America; 12 species (seven endemic) in China.
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| 1 |
Spathe basically purplish |
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(2) |
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Spathe basically green or white |
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(4) |
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| 2 (1) |
Flowering in autumn; spathe throat not auriculate. |
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55 A. thunbergii |
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Flowering in spring; spathe throat broadly auriculate |
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(3) |
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| 3 (2) |
Spathe limb basally narrowed, not united with oblong auricles, showing 3-lobed appearance. |
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49 A. auriculatum |
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Spathe limb basally expanded and united with expanded part of spathe throat, showing single cordate appearance. |
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56 A. cordatum |
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| 4 (1) |
Spathe white |
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(5) |
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Spathe green |
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(6) |
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| 5 (4) |
Leaf blade 3-foliolate; mature spadix bisexual. |
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53 A. odoratum |
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Leaf blade pedately 5-7(-9)-foliolate; mature spadix female. |
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54 A. mairei |
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| 6 (4) |
Central leaflet much smaller than adjacent lateral leaflets. |
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51 A. heterophyllum |
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Central leaflet ca. as large as or larger than adjacent lateral leaflets |
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(7) |
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| 7 (6) |
Spadix bisexual when mature. |
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50 A. tortuosum |
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Spadix female when mature |
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(8) |
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| 8 (7) |
Leaf blade (1-)3-5-foliolate; leaflets linear to narrowly oblong; ovary fusiform. |
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45 A. saxatile |
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Leaf blade 3- or 5- or more foliolate; leaflets lanceolate to oblong; ovary bottle-shaped |
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(9) |
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| 9 (8) |
Spadix appendix filiform, 8-16 cm, usually pendulous |
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(10) |
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Spadix appendix narrowly attenuate, less than 7 cm, curved forward |
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(11) |
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| 10 (9) |
Leaf blade 3-foliolate; mature spadix bisexual. |
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48 A. prazeri |
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Leaf blade 5-9-foliolate; mature spadix female. |
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52 A. aridum |
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| 11 (9) |
Leaf blade 3-foliolate. |
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46 A. yunnanense |
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Leaf blade 5-foliolate. |
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47 A. quinquelobatum |
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