Nepenthes ventricosa
Synonymy
- Type: Philippines, Luzon, Ilocos Prov., Piddig, F. M. Blanco (PNH†)
Other sources
Hooker, J.D. 1873 – In: de Candolle, A. L. P. P., Prodromus 17: 100
Beck von Mannagetta und Lerchenau, G. 1895: – Wiener Ill. Gart.-Zeitung 20: 149
Blume, C. L. 1852: – Mus. Bot. Lugd.-Bat. 2: 10
Burbidge, F.W.T. 1904: – Flora & Sylva 2: 114
Description
Climber, sometimes epiphytic, to at least 2 m tall. Stems winged to strongly triangular, 3.5-9 mm diam. Leaves chartaceous to thinly coriaceous, sessile, rosette leaves unknown, stem leaves with blade oblanceolate or narrowly oblong, 15-25 by 2-3 cm, apex acute, inconspicuously peltate, base gradually tapered, clasping the stem for 2/3 its circumference, decurrent, prominently winged to the node below or for only ± 1 cm. Longitudinal nerves 3-6 on each side of the midrib, evenly scattered. Pennate nerves oblique, obscure. Lower pitchers rare, as the upper but with tendril in front. Upper pitchers hourglass-shaped, 9-16 by 3-8 cm, basal half obliquely ellipsoid, apical half broadly infundibular, up to twice as broad as basal portion, waist constriction central, 1/2-1/3 the width of the base or apex, fringed wings absent, reduced to ridges < 1 mm wide; mouth circular to shortly elliptic, horizontal or slightly oblique, straight; peristome broad, subcylindrical, 10-25 mm wide, ribs coarse, 1-2 mm apart, outer edge with 4-6 slight undulations on each side, each protruding 3-4 mm, inner edge shortly dentate; lid membranous, narrowly elliptic, 4-6 by 1.8-2.25 cm, apex rounded, base rounded, lower surface lacking appendages, nectar glands absent from a band c. 6 mm wide along the midline, pit-like or slightly bordered, mostly orbicular 0.4-0.5 mm diam., less usually transversely elliptic, 0.8 mm long; spur flattened, 9 mm long, entire. Male inflorescence 28-60 cm long; peduncle 11-21 cm long; partial peduncles 70-180, 1-flowered; bracts absent; pedicels 5-10 mm long; tepals elliptic, 2-3.5 by 1.5 mm; androphore 3-3.5 mm long; anther head 1.5 mm wide. Fruit valves 25-32 mm long. Seed unknown. Indumentum absent from stems and leaves; pitchers with inconspicuous appressed scattered, simple reddish hairs 0.5 mm long; inflorescence as the pitchers, but densely hairy. Colour of pitchers uniformly creamish white, peristome red, inner surface yellowish.A
Notes
Nepenthes ventricosa is unlikely to be confused with the only other Luzon Nepenthes, N. alata. The angular stems and white, hourglass-shaped, upper pitchers of N. ventricosa make it easily distinguished. Nepenthes ventricosa is closely related to N. burkei of Mindoro and N. sibuyanensis of Sibuyan, but neither have the white, highly constricted pitchers of N. ventricosa.
Blanco’s types were destroyed at PNH, but duplicates may exist elsewhere (see notes under N. alata).A
Blanco’s types were destroyed at PNH, but duplicates may exist elsewhere (see notes under N. alata).A
Distribution (General)
Philippines: Luzon.A
Habitat
Low mossy oak forest; 1200-1500 m.A
Specimens
| Country | Date | Collector + collecting number | Herbaria | Type | Scan | Derivatives | |
|---|---|---|---|---|---|---|---|
| Blanco, F. M. | PNH† |  | |||||
| Citation: Philippines, Luzon, Ilocos Prov., Piddig, F. M. Blanco Specimen summary: PNH† Type for: Nepenthes ventricosa Blanco | |||||||