Hapaline appendiculata Ridley
J. Straits Branch Roy. Asiat. Soc. 49:47 (1908 ('1907')); Bogner
in Pl. Syst. Evol. 144: 62 (1984). Type: Sarawak, Ridley 12411 (holotype
SING!; isotype K!).
Slender, tuberous, evergreen
perennial herb up to 20 cm high. Stem: tuber cylindric, 1.5 x 1
cm; stolon unknown. Roots c. 0.25 - 0.33 mm in diam. Leaf: prophyll
linear, up to 9 x c. 4 mm, acute; cataphyll oblong-lanceolate to
linear triangular or triangular, up to 10 cm x 5 mm, attenuate to
acute; petiole 2.5 - 12 cm x 1 - 2 mm; leaf blade ovate to hastate
to subsagittate, 10 - 16 x 3.5 - 6.5, coriaceous, light to dark
green, occasionally with pale green diffuse markings, cm, margins
smooth, apex acuminate, posterior lobes rounded to subacute, divergent
to almost parallel, rarely absent. Inflorescence: 3 - 4 together;
peduncle 4- - 10 cm x 0.25 - 0.5 mm; spathe 2 - 3 cm long; spathe
limb elliptic, 1.6 - 2.6 cm x 5 - 7 mm, apex acute to briefly attenuate,
base decurrent into lower spathe; lower spathe margins clasping,
4 - 8 x c. 1.5 mm; spadix 2.5 - 3.5 cm x 0.25 - 1 mm, free portion
cylindric, up to 8 cm long, tapering apically into an greatly attenuated
appendix composed of fused synandrodes. Flowers: synandria irregularly
elongate in plan view, 2 - 3 x 0.5 - 1 mm; ovaries bottle-shaped,
1.5 x 0.7 mm, 2 - 3 in a single row; stigma capitate, c. 0.2 mm
in diam., papillose; style very short. Infructescence: enclosed
by the persistent lower spathe, 2 cm x 4 mm, few-berried; berries
more or less globular, c. 4 mm in diam, stigmatic remains persistent,
not prominent. (Fig. 1).
Malaysia (Sarawak). SARAWAK. 1st Division: Bau, Bidi, 6 Dec. 1905,
Hewitt 476 (K (photo!), SING!). 7th Division: Belaga Distr., Punan
Lusong to Long Jakah, 8 Sept. 1978, Burtt & Woods 11477 (E!); Puak,
Sept. 1890, Ridley 12411 (holotype SING!; isotype K!).
HABITAT. In humus
at path side on basalt. Hapaline appendiculata appears to
be one of the rarest aroids in Borneo, with only four collections
known to date. One of these, made by Anderson near Bau in the 1st
Division of Sarawak, was later cultivated at Singapore Botanic Gardens
and noted to have variegated leaves. Herbarium material of this
collection was never prepared (Bogner 1984). Hapaline appendiculata
is allied to H. celatrix in having evergreen coriaceous leaves and
a terminal sterile appendix composed of fused synandrodes. In H.
appendiculata this sterile appendix is greatly extended into
a tail-like process. One of the cited collections (Hewitt 476) has
ovate leaf blades lacking posterior lobes. Study of the inflorescences
reveals no significent floral differences from typical H. appendiculata.
Given the paucity of H. appendiculata collections I am not
attaching any taxonomic significance to this vegetative variation.