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19. Sauromatum Schott in Schott & Endlicher, Melet. Bot. 17. 1832.
斑龙芋属 ban long yu shu
Authors: Heng Li & Wilbert L. A. Hetterscheid
Herbs, seasonally dormant. Underground part a depressed-globose tuber. Leaves entire, sagittate-hastate, 3-lobed or -partite to pedatisect. Inflorescence simultaneous with or preceding leaves; peduncle short. Spathe divided into a connate or strongly convolute basal part with a ± strong apical constriction and a spreading lanceolate to ovate-triangular limb. Spadix as long as spathe, with 4 zones: a proximal female zone, an intermediate sterile zone with staminodes all over or only at base, a male zone, and a sessile or stipitate appendix. Female flowers 1-loculed with 1 or 2(or 3) orthotropous basal ovules. Proximal staminodes clavate, distal ones (when present) irregularly cristate or elongate aristate. Male flowers with 1-3 stamens opening by slits or pores; connective sometimes prolonged. Fruiting zone with spathe caducous or remaining; berries ovoid, 1(or 2)-seeded. Seeds with endosperm.
Eight species: Bhutan, Cambodia, China, India, Indonesia, Laos, Myanmar, Nepal, Thailand, Vietnam; seven species (two endemic) in China.
See the comment under Typhonium above.
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| 1 |
Sterile zone between male and female zones largely smooth and terete or grooved, except for proximal part carrying staminodes |
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(2) |
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Sterile zone between male and female zones fully covered with staminodes, distally gradually becoming smaller |
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(4) |
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| 2 (1) |
Leaf and outside of spathe densely hirsute. |
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5 S. hirsutum |
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Leaf and outside of spathe glabrous |
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(3) |
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| 3 (2) |
Spathe base fully closed (margins connate), limb inside with background off-white, almost entirely hidden by numerous strongly confluent, oval, deep maroon spots; leaves always pedate. |
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7 S. venosum |
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Spathe base convolute (margins overlapping), limb inside uniformly whitish green, or with purple stripes, or uniformly purple; leaves varying (often in one plant) from entire to pedate. |
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2 S. diversifolium |
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| 4 (1) |
Leaves simple, cordate, at least 10 cm. |
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4 S. giganteum |
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Leaves pedate |
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(5) |
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| 5 (4) |
Spathe base convolute. |
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6 S. horsfieldii |
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Spathe base fully closed, margins connate |
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(6) |
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| 6 (5) |
Proximal staminodes gradually changing upward from clavate through irregularly short and curved to irregularly cristate or strongly reduced to almost absent; petiole often with 1 or a few intercalary bulbils near base. |
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3 S. gaoligongense |
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Intermediate staminodes absent between proximal (clavate) and distal (irregularly cristate) staminodes. |
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1 S. brevipes |
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Lower Taxa
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Treatments in Other Floras @ www.efloras.org
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