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FOC | Family List | FOC Vol. 19 | Acanthaceae | Strobilanthes

78. Strobilanthes extensa (Nees) Nees in A. Candolle, Prodr. 11: 191. 1847.

棒果马蓝 bang guo ma lan

Goldfussia extensa Nees in Wallich, Pl. Asiat. Rar. 3: 88. 1832; Pteracanthus claviculatus (C. B. Clarke ex W. W. Smith) C. Y. Wu ex C. C. Hu; P. duclouxii (C. B. Clarke ex Benoist) C. Y. Wu & C. C. Hu; P. extensus (Nees) Bremekamp; Strobilanthes claviculata C. B. Clarke ex W. W. Smith; S. duclouxii C. B. Clarke ex Benoist.

Subshrubs 0.5-2 m tall, much branched, anisophyllous. Stems erect, glabrous or pilose. Petiole (0-)5-10 mm, narrowly winged, sparsely pubescent; leaf blade ovate, lanceolate, or oblong-lanceolate, 4-15 × 1-5 cm, both surfaces with prominent cystoliths, abaxially subglabrous to pilose, adaxially glabrous or sparsely pilose, secondary veins ca. 5 on each side of midvein, base cuneate, margin remotely serrate, apex acuminate and falcate. Inflorescences axillary or terminal, spikes, to 5 cm, very lax, 2-6-flowered; peduncle and rachis densely hirsute; sterile bracts intergrading with leaves but sessile, ovate to lanceolate, to 6 × 2.5 cm, glabrous or pubescent, base cuneate to cordate; floral bracts ovate to linear, 3-6 × 1.5-4 mm, persistent, gland-tipped pilose; bracteoles oblong to elliptic, ca. 4 × 1-3 mm, gland-tipped pilose. Flowers usually paired, basally to 4 cm apart on rachis but apically closer. Calyx 1-2 cm, strongly accrescent in fruit, gland-tipped pilose, 5-lobed almost to base; lobes oblong-oblanceolate, one lobe 2-3 mm longer than others, apex spatulate and darker green. Corolla pale whitish purple to violet, 3.2-4 cm, ventricose, outside pubescent only on lobes, inside glabrous except for trichomes retaining style; tube basally cylindric and ca. 2 mm wide for ca. 1.2 mm then gradually widened to ca. 1.5 cm and bent at mouth; lobes orbicular, ca. 5 mm in diam. Stamens 4, included; filaments glabrous, shorter pair 3-4 mm, longer pair 7-8 mm; anther thecae oblong, ca. 2.5 × 1 mm, erect; pollen type 3. Ovary glabrous, apex with numerous sessile glands; style ca. 3.2 cm, sparsely pilose. Capsule clavate, 10-16 × ca. 2 mm, apically thinly gland-tipped pilose, 4-seeded. Seeds ovate in outline, ca. 3 × 2.5 mm, pubescent; areola small. Fl. Aug-Oct, fr. Oct-Dec.

Mixed forests; 1900-2200 m. Sichuan, Yunnan [Bhutan, India, ?Nepal].

Strobilanthes extensa is very variable in leaf blade, bract, and bracteole shape and in the density of the indumentum.


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