Nepenthes deaniana

Nepenthes deaniana

Synonymy

Nepenthes deaniana Macfarl. in Engler, Pflanzenr. IV. 111 (Heft 36): 57. 1908 sec. McPherson 2009
    • Holotype: Philippines, Palawan, Mt Pulgar, Curran 3891 (PNH†).

Description

Most plants produce a compact rosette or a short, rigit, upright stem to 1 m tall. Very occasionally, strong climbing stems up to 6 m are produced, and these bear upper pitchers.
The lamina is oblong, up to 40 cm long and 18 cm broad. The apex of the leaf is rounded or obtuse and the base is abruptly contracted into a canaliculate petiole that clasps the stem. The apex of the lamina is occasionally sub-peltate, and the tendril may emerge up to 10 mm from the apex of the leaf. The lamina is green and the stem, midrib and tendril are yellow. The tendrils, pitchers and the upper side of the lid are lined with short, reddish-brown hairs. The stem, inflorescence and upper surface of the leaves are generally glabrous.
The lower pitchers are up to 30 cm tall and 20 cm wide, and may have a total volume of 1 litre (Stewart McPherson, pers. observ.), though I suspect that more extensive observation will reveal traps in excess of 1.5 litres in volume. The lower pitchers are variable in shape and may be ovate, globose, amphora-shaped, urceolate, or almost cylindrical. Wings up to 18 mm wide, fringed with filaments up to 15 mm long, run down the front of the lower pitchers. The peristome is loosely cylindrical, up to 2.5 cm wide and expanded towards the sides and back of the pitcher opening. The peristome is lined with ribs up to 2 mm high, spaced up to 3 mm apart. The ribs are elongated on the inner edge of the peristome and form incurved, needle-like teeth approximately 4 mm long. The peristome is raised at the back of the pitcher opening, immediately below lid. At this point, the peristome teeth are particularly prominent and splayed forward. Occasionally, the peristome is slightly raised at the front of the pitcher opening and forms a distinctive triangular point. The outer margin of the peristome is recurved and often crenellated. The inner edge of the peristome extends into the pitcher opening for several millimetres, particularly below the lid. The lid is broadly elliptic to ovate, up to 8 cm long, 6 cm wide, and lacks appendages. The spur is narrow, unbranched and up to 15 mm long.
The exterior of the lower pitchers may be orange, red or reddish-brown, sometimes mottled with faint, dark purple blotches. The interior of the pitcher is yellowish-orange and the peristome is orange, red or purple. Both sides of the lid are the same colour as the exterior of the pitcher, and sometimes decorated with darker flecks. The colouration darkens as the pitchers age, much like N. attenboroughii and N. rajah.
True upper pitchers are produced more rarely, on strongly climbing stems. Intermediate pitchers are more common, and these show characteristics of both upper and lower traps. The upper traps are wholly infundibular, often narrowly so, up to 35 cm tall, and up to 16 cm wide. Wings are reduced to narrow ridges that run down the front of the traps. The peristome is loosely cylindrical, up to 1.5 cm wide, and slightly expanded towards the sides and back of the pitcher opening. The peristome is lined with ribs up to 1.5 mm high, spaced up to 2 mm apart. The ribs are elongated on the inner edge of the peristome and form incurved, needle-like teeth up to 3 mm long. The peristome is raised at the back of the pitcher opening, immediately below lid. At this point, the teeth are particularly prominent and splayed forward. The outer margin of the peristome is strongly recurved. The lid is broadly elliptic or ovate, up to 7 cm long, 5.5 cm wide, and lacks appendages. The spur is narrow, unbranched and up to 15 mm long.
All parts of the upper pitchers are yellow, with orange colouration on the vestigial wings, peristome and lid. The intermediate pitchers are more variable in colouration, and may be marked with dark red or purple blotches on both the interior and exterior of the pitcher, and often have a red or purple peristome.
The inflorescence is a raceme, to 40 cm long. The peduncle is up to 20 cm long, the rachis to 25 cm long. Flowers are borne on 1- or 2-flowered partial peduncles, sometimes with narrow bracts to 2 mm long, with pedicels to 15 mm long. Tepals are ovate and up to 6 mm long and the anther head is borne on a column up to 4 mm long. Fruits are up to 12 mm long and borne on bractless pedicels to 18 mm long.A

Notes

Nepenthes deaniana was described from Palawan but referred tentatively, on the basis of its short and incomplete description, to N. alata (Jebb & Cheek Blumea 42 (1997)). It may well yet represent a fourth species of Nepenthes for Palawan, but neither illustration nor original material has been traced. Nepenthes deaniana has characteristics in common with N. mira, but differs, for example, in being a much smaller, non-climbing plant, 20-30 cm tall, with glabrous stems (not strongly petiolate, 35-50 by 8-10.5 cm) and partial peduncles bracteate and 1-flowered (not ebracteate and 2-flowered).
The Manila herbarium was destroyed in 1945. We have searched the following herbaria without success for duplicates of the type specimen or for any other material that matches the original description: B, BM, BO, DBN, FHO, FI, K, KEP, L, OXF, P, S, SAR, TCD, U, US, W.B

Etymology

The specific epithet honours the Philippine plant collector and explorer, Dean C. Worcester.A

Habitat

Terrestrially in mossy, upper montane forest and scrub and in small clearings; 1180-1300 m.A

Bibliography

A. McPherson, S. R. 2009: Pitcher Plants of the Old World 1
B. Cheek, M.R. & Jebb, M.H.P. 2001: Flora Malesiana - Nepenthaceae, Series I, Volume 15

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Curran 3891PNH†
Citation: Philippines, Palawan, Mt Pulgar, Curran 3891.

Specimen summary: PNH†
Holotype of Nepenthes deaniana Macfarl.