Hoya angustisepala Schlechter 1830
In leaflets of Philippine Botany 10 (1938-39) 3585. Hoya angustisepala Schlechter ex Elmer Syn.: Hoya mindanaensis.
Hoya angustisepala Burton 1987
Type description:
In Hoyan 8 /2 (1987) b. C. M. Burton. Hoya angustisepala Burton n.s. Ramulis crassis 5 - 6 mm. in diametro, glabris; foliis crasse coriaceis, glabris, oblongis ad oblong-ovatis, usque 15 cm longis, 6 cm latis, basi late rotundatis vel obscure emarginatis, apice acutis ad subacuminatis, nervis utrinque 3 - 5, nervis tenuis; petiolo crasso ad 2 cm. longo, glabro superne sulcato. Inflorescentiae umbelliformis descendens; pedunculo crasso 8 - 12 cm longo; pedicellis ca. 5 cm longis. Calycis segmenta linearis 5 - 7.5 mm longis, margine, ciliata. Corolla lobis late ovatis, conduplicatis, apices reflexus, extus glabra, intus puberula, 2 - 2.5 cm. diametro. Corona squamis scrotiformis, subtus late sulcatis, apice interno acuto, externo recurvato obtusatus. Pollinia longis, gracilis; translatoribus longis, alveiformis; retinaculo longis, gracilis.
Translation: Stems thick 5 - 6 mm. in diameter, glabrous, leaves very leathery, glabrous, oblong nearly oblong-ovate, as long as 15 cm., 6 cm. wide, base broadly rotund or obscurely emarginate, apex acute nearly subacuminate, nerves on both sides 3-5, nerves thin; petiole thick nearly 2 cm. long, glabrous deeply grooved, Inflorescence umbellate hanging down; peduncles thick 8 - 12 cm. long; pedicels about 5 cm. long. Calyx segments linear 5 - 7.5 mm. long, margines ciliate. Corolla lobes wide, ovate, conduplicate. apices reflexed, outside glabrous, inside puberulous, 2 - 2.25 cm. in diameter. Corona scales pouch-shaped, below broadly grooved, internal apex acute, outer recurved obtuse. Pollinia long, narrow, translators long, pitted, retinaculum long, narrow.
Other literature:
In The Asclepiadaceous Works of Friedrich Richard Rudolf Schlechter (1992) 30. A. Nicholas. H. angustisepala Schlechter ex Burton (Elmer 10829) - *
In Dr. Schlechter’s Hoya Species (1993) 28-29 R. D. Kloppenburg. Hoya angustisepala Burton. Hoya mindanaensis Elmer (invalidly published in English). Hoya angustisepala Schlechter (unpublished).
Branches thick 5-6 mm. in diameter, glabrous, with the leaves thickly leathery, glabrous, oblong to oblong ovate, all the way to 15 cm. long, 6 cm. wide, base broadly rounded or obscure emarginate (shallowly notched), apex acute to somewhat acute, nerves on both sides 3-5, nerves fine; petiole thick to 2 cm. long, glabrous above, below sulcate, with the inflorescence shaped like an umbel descending, peduncle thick 8-12 cm. long; with the pedicels about 5 cm. long, with the segments of the calyx linear 5-7.5 mm. long, margin ciliate. Corolla lobes broad ovate, folded together, with the tips reflexed, outside glabrous, inside puberulous, 2-2.5 cm. in diameter. Corona scales pouch-shaped, below broadly sulcate, internal apex acute, external recurved obtuse. Pollinia long, narrow; translators long, trough shaped, retinaculum long narrow.
Published by C. Burton in: 1987 The Hoyan V.8 #4 part 2 p.b.
In Philippine Hoya Species 3 (1996) 31-32. R. D. Kloppenburg. In the Hoyan 8 #4, a-b. (1987). Hoya angustisepala Burton Syn. H. mindanaensis Elmer. Leaflets of Philippine Botany, 10 Art. 131 (1938) 3584.
Type: Elmer #10829, I designated rdk, (H. angustisepala Schltr. unpublished). in the woods along the Sibulan River at 3000 ' altitude, Todaya (Mt. Apo), Davao, Mindanao, June 1909.
Elmer's English description "Branched vines, climbing over dense jungles along creeks and river. Stem terete, curved, occasionally twining, the size of a lead pencil, flexible, glabrous, smooth and yellowish, containing latex, the heavy but slender branchlets green and hanging, tan color when dry, the older one sublucid and ridged longitudinally, the ultimate branches relative thin. Leaves opposite, persistent, scattered, mainly descending, thickly coriaceous, yellowish green beneath, tips recurved, otherwise nearly flat or only the entire margins slightly imbricate, also glabrous and smooth, curing subolivaceous on both sides, oblong or more often ovately oblong, base broadly rounded and sometimes obscurely emarginate, the upper portion of the laminae gradually tapered into the acute to subacuminate apex, the average blades 15 cm. long by 6 cm. wide across the middle or a trifle below it, persistent; midrib thick and pronounced beneath clear into the apex and olivaceus in color, on the upper surface deeply and narrowly grooved, totally glabrous on both surfaces; nerves faint, 3 to 5 on each side of the midrib, slightly ascending and straight, forked from above the middle and reticulately united, sometimes with secondary nerves in between, reticulations coarse and only visible from beneath; petioles up to 2 cm. in length, blackish brown on my dried specimen, also thick, rugose, glabrous, caniculate along the upper side, persistent, leaving a triangular shaped scar after falling. Inflorescence faintly odorous, upon 8 to 12 cm. long green stalks; peduncles arising from the upper side of the stem or twigs between the leaves, terete, descending, with few hairs, becoming glabrate, very minutely tubercled; pedicels umbellately spreading, as much as 5 cm. in length, likewise terete and green when fresh, very seldom dull purple on the exposed sides, very slender, glabrate when old, it with the peduncle nearly black in the dry state; dry flowers flat and blackish; sepals 5, green but drying nearly black, very linear, 0.5 to 0.75 cm. long, minutely puberulent, radially spreading; corolla broadly ovate in general outline, the apical portion strongly inflexed, their lateral sides appearing as horned lobes, finely tubercled on the outside, inner surface covered with a yellowish gray felt or tomentum, apex acute, united toward the adnate base and thereby forming a short and very thick tube or column, the larger ones almost 1 cm. long, not quite so broad, dirty white and with yellowish tips; horns of the corona glossy, very rigid and thick, ascending, 5 or as many as corolla segments, pouch like, with a blunt recurved point and on the inner and upper side with a pair of sharply pointed processes; the stamen located on the inner basal parts and enclosing the pistil or rather the stigmas. Buluntine in Bagobo."
Meaning: angustisepala — L. angustus; sepala. With narrow sepals.
Note: Placed into Synonymy with Hoya coriacea Blume 1826 by Dale Kloppenburg.