Table 1.

Morphological comparison of key characters in Hiptagepauciflora, H.ferruginea and the morphological similar taxa.

Character	Hiptage pauciflora	H. benghalensis	H. multiflora	H. ferruginea	Hiptage calcicola
Leaf blade	ovate or ovate-elliptic to elliptic-oblong, 6.0–10.5 × 2.5–12.0 cm	oblong, elliptic-oblong, or ovate-lanceolate, 9–18 × 3–7 cm	oblong, 12–13 × 5–5.5 cm	elliptic or elliptic-oblong, 6.0–7.5 × 2.2–2.8 cm	elliptic or ovate, 3–10.5 × 1–4.5 cm
Leaf marginal gland dots	3–6 pairs	2–8 pairs	2–4 pairs	1 pair	absent
Leaf basal gland dots	absent	1 pair	1 pair	absent	absent
Larminal gland dots	absent	absent	absent	absent	1–2 pairs
Bracteoles	lanceolate, 7–11 × 1–3 mm	acute, ca. 1mm	ovate-triangular, ca.1 mm	ovate-triangular, ca.1 mm	acute, ca. 1mm
Flowers	pink	white	white?	pink to pinkish-white	white
Pedicels	pubescent,1.8–2.9 cm	pubescent, 0.8–2.5 cm	puberulent, ca. 1 cm	dark red hairy, 0.5–1.3 cm	pubescent, 0.4–2 cm
Calyx glands	ovate or sub-orbicular to cordate, scarcely decurrent to pedicel	elliptic, oblong, triangular, lanceolate to oblanceolate; more or less decurrent on the pedicel	sub-orbicular; not decurrent to pedicel	absent	inconspicuous or absent
Sepals	elliptic to ovate-elliptic	broadly elliptic or ovate	ovate	elliptic to ovate-elliptic	elliptic
Petals	ovate-oblong to sub-orbicular	ovate-oblong to suborbicular, glabrous	unknown	suborbicular, 7–8 × 6–7 mm	suborbicular, 3.5–4 × 3.5–4 mm
Claw	1–1.5 mm	1–2 mm, glabrous	unknown	2.5–4 mm, pubescent	1–2 mm, hairy
Middle wings of Samara	obovate-elliptic, 1.7–2.5 × 1–1.3 cm	oblong, elliptic or obovate-lanceolate, 3–5 × 1–1.6 cm	obovate, 2.2–2.5 × 0.7–1.0 cm	obovate, 1.7–2 × 1–1.2 cm	oblong, 2–2.5 × 0.5–0.8 cm