Description from Flora of China
Bembix tectoria Loureiro, Fl. Cochinch. 1: 282. 1790; Ancistrocladus carallioides Craib; A. cochinchinensis Gagnepain; A. extensus Wallich ex Planchon; A. hainanensis Hayata; A. harmandii Gagnepain; A. pinangianus Wallich ex Planchon.
Juvenile plants unknown but probably erect. Adult stems climbing to 20 m high; lateral branches with recurved to spiraling hooks. Stipules tiny, mostly caducous with saddlelike scars on branches; leaves at branchlet apices elliptic to obovate, 7-38(-50.2) × 2.1-9.3(-11.7) cm, leathery, both surfaces frequently with small, white, orbicular pits, base attenuate and decurrent, apex rounded or rounded-obtuse, rarely acute; midvein prominent abaxially, impressed adaxially, lateral and reticulate tertiary veins tenuous, slightly prominent on both surfaces. Inflorescence lax to congested, paniculate, lateral among leaves at apices of branches; bracts triangular to ovate, 0.2-2.4 × 0.2-1.5 mm, abaxially eglandular or with 1 or 2 circular glands, margin fimbriate-erose, apex acute. Pedicel 0.3-3 mm. Sepals 5, at base shortly decurrent on ovary, suborbicular to elliptic-oblong, slightly unequal, 3.2-5.5 mm, outside eglandular or with 1-4 shallowly cupular glands below middle, inside with white orbicular small pits near base, apex rounded. Petals 5, convolute, connate basally, suborbicular to obliquely elliptic, 5-6 mm, apex acute, usually involute. Stamens in 1 whorl, 5 longer than others; filaments wider basally, dimorphic: shorter ones 0.3-1.2 mm, longer ones 1.1-2 mm. Ovary fully inferior; styles 3, erect, ca. 1 mm; stigmas ca. 0.2 mm. Nut red, obconic, sides 5-ridged by decurrent margins of accrescent sepals, 5-9 mm, 5-10 mm in diam.; persistent sepals spreading, narrowly oblong to spatulate, unequal, larger 3 sepals 3-5.6 × 1-1.7(-2.5) cm, smaller 2 sepals 2-3(-4) × 0.5-1.2(-1.9) cm, veined, apex rounded. Seeds subglobose. Fl. Apr-Jun, fr. Jun [fl. and fr. year-round outside of China].
Evergreen tropical forests in valleys and on slopes; 500-700 m [sea level to 1600 m outside of China]. Hainan [Cambodia, India (Andaman and Nicobar Islands), Indonesia, Laos, Malaysia, Myanmar, Singapore, Thailand, Vietnam].