Trichodesma calycosum Collett & Hemsl.

Subshrubs, 1-2.5 m tall. Branches becoming somewhat tetragonous, glabrous. Leaves opposite, elliptic to broadly elliptic, 1-2.8 cm × 4-8 cm, strigose, abaxially more densely strigose, base attenuate to short petiole, margin entire. Cymes terminal, paniculate, to 20 cm, densely rust-colored short hispid. Pedicel slender, usually irregularly curved; bracts ovate-lanceolate to lanceolate, 2-4 × 0.5-1.5 cm, ± sessile. Calyx campanulate, ca. 1.5 cm, enlarged and inflated in fruit to 4 cm wide, strigose outside; lobes ovate-triangular, apex caudate-attenuate. Corolla white or pinkish, slightly longer than calyx, densely tomentose below inside; throat 10-appendaged; lobes ovate. Anthers lanceolate, connectives exserted from corolla. Ovary 1-3-lobed, other lobes aborted. Nutlets broadly ovoid, ca. 5 × 4 mm, margin of abaxial surface leathery, irregularly obtuse-dentate. Seeds orbicular, complanate. Fl. Jan-Mar.

Guizhou, Taiwan, Yunnan [India, Laos, Myanmar, Thailand]

Hillside meadows, thickets, forests; 500-2200 m.

Mao ty đài (danh pháp: Trichodesma calycosum) là loài thực vật có hoa trong họ Mồ hôi. Loài này được Collett & Hemsl. mô tả khoa học đầu tiên năm 1890.

毛束草又名假酸漿（学名：Trichodesma calycosum）是紫草科毛束草属的植物。分布在锡金、秦国、老挝、缅甸以及中国大陆的云南、贵州等地，生长于海拔500米至2,200米的地区，也分布在台灣的中南部低海拔山坡林緣、樹叢、路旁及平野地區及林下，原住民採集嫩葉生食或煮食有時也用來包裹食物，是一種日常的食用野菜，在排灣族及魯凱族中有一種傳統美食，不論外型和口感都跟漢族所吃的肉粽相似，它們稱為「abay」，abay(阿拜)是小米糕的意思，類似粽子，阿拜是各種節慶時必須製作的食物，包裹的食料主要為小米和豬肉和一般肉粽不同的是，食料先用假酸漿葉包，好外頭再以月桃葉子包裹，粽子煮熟後食用時連同假酸漿葉一起吃，據說有助於消化。