Reinwardtia glandulifera Y.H.Tan, S.S.Zhou & B.Yang, 2017

Yang, Bin, Zhou, Shi-Shun, Maung, Kyaw Win & Tan, Yun-Hong, 2017, Reinwardtia glandulifera (Linaceae), a new species from Kachin State, northern Myanmar, Phytotaxa 316 (3), pp. 297-300 : 297-300

Reinwardtia glandulifera Y.H.Tan, S.S.Zhou & B.Yang , sp. nov. ( Figs. 1–2 )

Type:— MYANMAR. Kachin State: Putao, Shinsanku, understory shrub in seasonal tropical rain forests, 97°51 ʹ 9.47 ʺ E, 27°43 ʹ 28.99 ʺ N, 1020 m, 12 December 2016, Myanmar Exped. 877 (holotype: HITBC!).

Reinwardtia glandulifera is similar to R. indica , but differs in its elliptic to obovate-elliptic bracts and calyces, 6.0–7.5 × 2.0– 3.5 mm, with dense glandular hairs on the margins, petals free at the base and flowers with five styles.

Shrubs, ca. 1.5 m tall. Twigs subterete, longitudinally striate, glabrous. Leaves scattered, dense at apex of twigs. Petiole 3.0–7.0 mm long, glabrous; blades elliptic to obovate-elliptic, 3.2–10.8 × 0.8–3.3 cm, glabrous, midveins raised on dorsal sides, secondary veins slightly conspicuous on both surfaces, base cuneate, margin entire, glabrous, apex acute to almost round with an apiculate apex. Inflorescence terminal or axillary, thyrse or cymes, 3–many-flowered; peduncle 0.5–2.8 cm long; basal bracts leaflike, caduceus; bracts elliptic to obovate-elliptic, 6.0–7.5 × 2.0– 3.5 mm, with marginal glandular hairs (0.3–0.5 mm long); pedicels 0.4–0.9 cm long, glabrous. Calyx oblong-elliptic to obovate-elliptic, sepals 6–8 × 3–4 mm, distinct but basally confluent, with marginal glandular hairs (ca. 0.2 mm long), slightly conspicuous at apex. Flowers heterostylous, 1.8–2.8 cm in diameter. Petals yellow, obovate-lanceolate, 1.6–1.9 × ca. 0.8 cm, distinct but basally confluent slightly. Pin flowers with stamens ca. 0.8 cm, more or less free or united to form a ring only at the base; anthers ca. 1.5 mm, staminodes subulate. Styles 5, 1.3–1.5 cm, filiform, free but fused at the base; stigma capitate. Thrum flowers with stamens ca. 1.4 cm, more or less united to form a ring only at the base; anthers ca. 1.5 mm, staminodes subulate. Styles 5, filiform, free but fused at the base, 0.8 cm long; stigma is capitate. Ovary 5-carpellate, each syncarpous with 2 small locules, each locule with 1 ovule. Capsule globose, splitting into 10 mericarps. Seeds reniform or elliptic.

Phenology:— Flowering October to November and fruiting November to February.

Distribution and habitat:— This new species is known from Putao, Kachin State, where it grows in the understory of seasonal tropical rain forests and tropical mountain forests, 900–1300 m.

Etymology:— The species epithet refers to the bracts and calyces with conspicuous glandular hairs along the margin.

Affinities:— This species is similar to R. indica , particularly in the ovate and oblong leaves and yellow corolla, but it differs in its bracts, calyx and other flower featuress ( Table 1, Figs. 1–2 ).

Additional specimens examined:— MYANMAR. Kachin State: Putao, Shinsankuku, 97°53 ʹ 10.48 ʺ E, 27°41 ʹ 17.60 ʺ. Understory shrubby herbs in tropical mountain forests, elev. 1100 m, November 27, 2014, Myanmar Exped. 156 (HITBC, KUN).

Figures

FIGURE 1. Reinwardtia glandulifera. A–B. Habit. C. Inflorescence. D–E. Fruit. F–G. Stamen and pistil, showing heteromorphy. H. Petals. I. Bract and calyx. Photographed by Yun-Hong Tan.

FIGURE 2. Reinwardtia glandulifera. A. Habit. B. Leaf. C. Stamen and pistil, showing heteromorphy. D. Petals. E. Bracts. F. Fruit. G. Capsule, showing regma in cross-section. H. Seed and locule. Illustration by Zheng-Meng Yang based on the holotype, Myanmar Exped. 877.