Phenology:: Bunga muncul pada bulan Februari - April.
Etymology : "omerodii" diberikan untuk menghormati Paul Abel Ormerod (1969-), yang berjasa besar dalam dunia peranggrekan di Asia dan Australia.
Description:
Epiphytic herbs. Roots 1.0– 1.4 mm in diameter, verrucose, greenish
white, becoming brown when old. Stem clustered, erect to semi pendant,
up to 30 cm long, basal 5 cm cylindrical, the remaining length
flattened, subclavate, distinctly grooved, brown to greenish brown;
internodes 8–13, (12–17) 22–27 mm long, (1.2–1.8) 7–8 mm in diam.,
covered with persistent sheaths. Leaves distichous, 6.5–8.0 cm long by
1.0– 1.3 cm wide (largest leaf), linear lanceolate, dark green suffused
with purple, chartaceous, glabrous on both sides, margin entire, apex
acute; sheath longer than the internode, striate, green with purplish
red streak when young, grey to brownish green when old. Inflorescences
shortly racemose, mostly borne from upper leafless stem, 1–2 per node
bearing 2–5 flowers, 1.2–1.5 cm long, peduncle and bracts persist after
flowering, peduncle suberect to pendant, terete, glabrous, brownish
green; floral bracts 1–2 mm long, triangular, greenish brown to
vermillion, glabrous on both sides, margin entire, apex attenuate.
Flower lasting 4–6 days, 2.2–2.4 cm long, 1.8–2.0 cm across, not opening
widely, amber, sepals richly stippled with purple outside, petals with a
narrow purple midline or midnerve, mentum suffused with purple, lip
with purple red blotches except the creamy white apex, column and column
foot with purple marks or markings. Pedicel with ovary 8–12 mm long,
cylindrical, sulcate, reddish green with purple streak, curved. Dorsal
sepal 5-nerved, porrect, 10.0– 10.2 mm long by 3.9–4.1 mm wide, ovate,
glabrous on both sides, margin entire, apex acute. Lateral sepals
6-nerved, spreading, inner margin 10.0– 11.4 mm long, outer margin 17.0–
17.6 mm long, 5.0– 5.5 mm wide, obliquely triangular, falcate, margin
entire, apex acute, cucullate. Mentum narrowly conical, 9.0– 10.2 mm
long, 4.2–4.4 mm across at the widest point, 2.6–2.8 mm wide at the
apex, somewhat incurve, apex truncate to obtuse. Petals 5-nerved,
spreading, 12.0– 12.4 mm long by 3.0– 3.4 mm wide, oblong to narrowly
obovate, apex acute, curved upwards. Lip 2.0– 2.2 cm long, rhombic from a
short claw, erect, concave, shortly clawed or unguiculate; claw
ligulate-oblong, fleshy, basal 1–2 mm adnate to the column foot, free
part 5–6 mm long, in total ca. 6–7 mm long by 1.7–2.0 mm wide; blade not
trilobed, broadly ovate to elliptic (when flattened), 14–15 mm long by
8–9 mm wide at the centre, 4.0– 4.5 mm wide at the apex (when
flattened), glabrous on both sides, shortly ventricose to
excavate-concave below, suberect, apex recurved, margin minutely erose
to entire, undulate, obtuse-truncate; disc thick, with 3–5 low
longitudinal callus ridges from the centre to the apex of blade. Column
porrect, stout, 2.0– 2.5 mm long, 2.0– 2.2 mm in diam. at base; column
foot 9.4–10.0 mm long, slightly incurved; stelidia triangular, 0.5 mm
long, whitish with purple markings, obtusely acute; stigma oblong,
0.8–1.0 mm in diam.; rostellum absent; pollinia 4, in two pairs, each
pair can be divided into two parts, c. 0.8 mm long; anther cap 1.7 mm
long, 1.3 mm across, ovate, white, cucullate. Capsule not seen.
Conservation status : ‘Data Deficient’ (DD) following IUCN (2019).
Mark Arcebal K. Naive, Frankie Handoyo and Jeffrey Champion. 2021. Dendrobium ormerodii (Orchidaceae, Dendrobieae), A New Dendrobium Species from Central Kalimantan, Indonesia. Phytotaxa. 524(3); 205-209. DOI: Phytotaxa.524.3.5; twitte orchidARCIIae
