Boehmeria siamensis Craib

The fibers are used to make ropes.

Shrubs or small trees, simple or branched distally, 1-3 m tall, to 1.5 cm in diam.; upper stems, branches, and petioles sparsely or densely strigose. Dioecious or monoecious. Buds ovoid, 2-5 mm; scales triangular-ovate. Leaves opposite, subequal in size; stipules lanceolate, 7-10 mm; petiole 0.3-1.2 cm; leaf blade light green when dry, narrowly ovate, elliptic, or rarely oblong, 5-15 × 2-8 cm, thickly papery, secondary veins 3 or 4 each side of midvein, abaxial surface with reticulate vein prominent, both surfaces sparsely appressed strigose, base subcordate or rounded, slightly oblique, margin serrulate, apex acuminate or shortly acuminate. Glomerules on axillary, densely congested, spikelike shoots, simple in distal part of twigs or in groups of 2 or more in axils of fallen leaves; male ones in lower axils, 4-6 cm; female ones in distal axils; bracts scarious, ovate, ca. 3 mm. Male flowers 4-merous, sessile; perianth lobes elliptic, 1.8-2 mm, densely puberulent, connate to middle; rudimentary ovule obovoid, ca. 0.4 mm. Fruiting perianth tube fusiform or narrowly rhomboid-obovoid, compressed, 1.8-2 mm, patent puberulent all over, base cuneate, apex long necked, 2- or 3-toothed. Fl. Mar-Apr, fr. Sep-Oct.

W Guangxi, S Guizhou, S Yunnan [Laos, Myanmar, Thailand, Vietnam].

Secondary forests, sunny thickets; 400-1800 m.

Boehmeria chiangmaiensis Yahara; B. spirei Gagnepain.

Boehmeria siamensis là loài thực vật có hoa trong họ Tầm ma. Loài này được Craib mô tả khoa học đầu tiên năm 1916.

束序苎麻（学名：Boehmeria siamensis）是荨麻科苎麻属的植物。分布在越南、泰国、老挝以及中国大陆的贵州、云南、广西等地，生长于海拔400米至1,700米的地区，常生于山地阳坡灌丛中和疏林中，目前尚未由人工引种栽培。