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FOC | Family List | FOC Vol. 19 | Acanthaceae

20. Rungia Nees in Wallich, Pl. Asiat. Rar. 3: 77, 109. 1832.

孩儿草属 hai er cao shu

Authors: Jia-qi Hu & Thomas F. Daniel

Herbs, decumbent to erect, with cystoliths. Leaves petiolate; leaf blade margin entire. Inflorescences axillary or terminal spikes, secund or 4-sided, sometimes reduced to a single flower; bracts 2- or 4-ranked but usually only 2 ranks fertile, homomorphic or heteromorphic, usually imbricate, margin usually scarious or hyaline; bracteoles similar to bracts or narrower. Calyx deeply 5-lobed; lobes equal or subequal. Corolla small; tube basally cylindric, distally ± expanded; limb 2-lipped; lower lip spreading, 3-lobed; upper lip erect, rugula (stylar furrow) present, margin entire to emarginate; lobes ascending cochlear in bud. Stamens 2, inserted in corolla throat; anthers 2-thecous; thecae subequal in size, superposed, lower one white spurred at base. Ovary with 2 ovules per locule; stigma entire or slightly 2-cleft. Capsule shortly stalked, ovoid or oblong, 4-seeded; retinacula present; septa (with attached retinacula) separating from inner wall of mature capsule. Seeds compressed, verrucose, lacking trichomes.

About 50 species: Old World tropics and subtropics; 16 species (12 endemic) in China.

1 Flowers solitary in apical leaf axils or in 2-sided spikes; bracts 2- or 4-ranked, all fertile   (2)
+ Spikes 1-sided; bracts 4-ranked, each 2 fertile or sterile   (6)
2 (1) Flowers solitary in apical leaf axils.   1 R. axilliflora
+ Flowers in axillary or terminal spikes   (3)
3 (2) Plants 6-10 cm tall; spikes globose or ovoid, 0.5-1 cm.   2 R. mina
+ Plants more than 20 cm tall; spikes cylindric, 1-7 cm   (4)
4 (3) Bracts without hyaline margin.   3 R. densiflora
+ Bracts with hyaline margin   (5)
5 (4) Bracteoles elliptic, ca. 1/2 as long as bracts.   4 R. chinensis
+ Bracteoles ovate-lanceolate, as long as bracts.   5 R. stolonifera
6 (1) Bract margins not ciliate   (7)
+ Bract margins ciliate   (8)
7 (6) Sterile and fertile bracts different in shape; fertile bracts oblong, ca. 0.7 cm, apex rounded.   6 R. guangxiensis
+ Sterile and fertile bracts similar in shape; fertile bracts oblong to elliptic-oblong, ca. 1.5 cm, apex acute.   7 R. pinpienensis
8 (6) Fertile bracts circular, obovate, elliptic, obovate-elliptic, or sphenoid, apex rounded, obtuse, or emarginate   (9)
+ Fertile bracts lanceolate-linear, oblong-lanceolate, lanceolate, ovate, or elliptic, apex acute, acuminate, or cuspidate   (12)
9 (8) Fertile bracts circular to obovate, apex rounded to obtuse to emarginate and mucronate.   8 R. pectinata
+ Fertile bracts sphenoid, elliptic, obovate, or obovate-elliptic, apex rounded and not mucronate   (10)
10 (9) Fertile bracts sphenoid.   9 R. monetaria
+ Fertile bracts elliptic, obovate-elliptic, or obovate   (11)
11 (10) Fertile bracts elliptic to obovate-elliptic.   10 R. longipes
+ Fertile bracts obovate.   11 R. bisaccata
12 (8) Bracts abaxially gland-tipped pubescent.   12 R. pungens
+ Bracts glabrous or non-glandular pubescent   (13)
13 (12) Fertile bracts elliptic, broader at middle   (14)
+ Fertile bracts ovate to ovate-lanceolate to lanceolate-linear, broader at base   (15)
14 (13) Leaf blade pubescent abaxially.   13 R. napoensis
+ Leaf blade glabrous on both surfaces.   14 R. yunnanensis
15 (13) Leaf blade glabrous.   15 R. taiwanensis
+ Leaf blade pubescent along veins and ciliate on margin.   16 R. hirpex

  • List of lower taxa


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