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FOC | Family List | FOC Vol. 23 | Araceae

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.

1 Sterile zone between male and female zones largely smooth and terete or grooved, except for proximal part carrying staminodes   (2)
+ Sterile zone between male and female zones fully covered with staminodes, distally gradually becoming smaller   (4)
2 (1) Leaf and outside of spathe densely hirsute.   5 S. hirsutum
+ Leaf and outside of spathe glabrous   (3)
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.   7 S. venosum
+ 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.   2 S. diversifolium
4 (1) Leaves simple, cordate, at least 10 cm.   4 S. giganteum
+ Leaves pedate   (5)
5 (4) Spathe base convolute.   6 S. horsfieldii
+ Spathe base fully closed, margins connate   (6)
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.   3 S. gaoligongense
+ Intermediate staminodes absent between proximal (clavate) and distal (irregularly cristate) staminodes.   1 S. brevipes

Lower Taxa


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