Chassalia calamus T.Y.Yu,

Turner, Ian M. & Cheek, Martin, 2021, Revision of Chassalia (Rubiaceae-Rubioideae-Palicoureeae) in Borneo, with 14 new species, European Journal of Taxonomy 738, pp. 1-60: 16-19

publication ID

https://doi.org/10.5852/ejt.2021.738.1261

DOI

http://doi.org/10.5281/zenodo.4599385

persistent identifier

http://treatment.plazi.org/id/355087D8-FFF6-E471-1811-FB97EEAEC0C0

treatment provided by

Plazi

scientific name

Chassalia calamus T.Y.Yu
status

sp. nov.

Chassalia calamus T.Y.Yu  sp. nov.

urn:lsid:ipni.org:names:77215404-1

Figs 8–9View FigView Fig

Diagnosis

Differs from other species in having a strong and thick, but hollow, stem 5–12 mm diameter (vs stem solid, ca 3–5 mm diameter); leaves large 17–33 × 5.5–12 cm (in most species except C. atropurpurea  sp. nov. and C. involucrata  sp. nov. not reaching these dimensions); inflorescence usually very short with peduncle very short or absent, (<0.1–) 0.5–3.5 cm (in other species usually exceeding 3.5 cm long); secondary peduncle usually very short to absent making the inflorescence highly compact.

Etymology

The epithet, treated as a noun in apposition, is derived from the Latin ʻ calamus  ʼ, a reed or more generally a hollow-stemmed plant. The name refers to the hollow stem, unusual in Bornean species of Chassalia  .

Type

MALAYSIA – Borneo , Sabah • Nabawan, Sungai Millian , along stream-side; 18 Nov. 1986; Asik Mantor SAN 118683; holotype: K[ K001129723]!; isotype: SAN  .

 

Additional material

MALAYSIA – Borneo , Sabah • Keningau, Crocker range area, mile 16, Kimanis Road; 23 Aug. 1986; Sumbing Jimpin SAN 120566View Materials; K!, KEP!, SAN  Tambunan, Sunsuron Km 54 Jalan Tambunan/ Penampang; alt. 1400 m; 24 Aug. 1989; Fidilis. K. SAN 127894View Materials; K!, SAN  Ranau, Ulu Tungud Forest Reserve , Gunung Monkobo Expedition ; 5°52′45″ N, 116°55′28″ E; alt. 343 m; Saw L.G. SAN 146079View Materials; K!, SANGoogleMaps  Tambunan, Rafflesia Information Centre , Hill Dipterocarp Forest ; 2 Sep. 2001; J.T. Pereira et al. JTP 845; K!, SAN  Pandewan, Sungai Pamentarian ; 25 Feb. 1987; Sumbing Jimpin SAN 120057View Materials; K!, SAN  .

Description

Herb, shrub to small treelet, (0.5–) 1–1.5 m tall, glabrous. Stem terete, flattened and slightly canaliculate, or sometimes deeply canaliculate, hollow. Lower internodes 3–6 × 0.5–1.2 cm, surface usually covered by pustules, internode of flowering stems shorter, 1–2.5 × 0.3–0.8 cm. Leave-blades elliptic to broadly lanceolate, very large, 17–33 × 5.5–12 cm, midrib raised both adaxially and abaxially, secondary veins 14–18 on each side, petiole flat, canaliculate, (0.5–) 1.5–5 cm. Stipule large, not sheathing, broadly flabellate, 0.8–1.2 × 0.8–2 cm, apex usually irregular. Inflorescence a compound cyme, peduncle very short to absent, (<0.1–) 0.5–3.5 cm, rachis and branches usually very short to absent, (<0.1–) 1.5 cm. Bracts 8–10 in each capitulum, pale green, 7–8 × 3–4 mm. Flowers 14–20 in each capitulum, pedicel short or absent, hypanthium ellipsoid, 1.5 × 1.5–2 mm, calyx tube slightly curved, 1.5–1.8 × 0.5 mm in total, corolla whitish green, cream-white or yellowish white, 10–12 × 0.5 mm, corolla tube 0.5 mm wide at base, broadening in distal third to 2.5 mm wide; corolla lobes triangular, 2–2.5 × 1.5 mm. Disc cylindric, 0.8 × 0.5 mm. Stamens 2.2 × 0.2 mm, anthers placed at the mouth of corolla, filament insertion 8 mm from base of corolla, filament very short, less than 0.1 mm long, band of hairs 0.5–1 mm wide, at base of stamens 8 mm from mouth of corolla tube, hairs erect, colourless, 0.1–0.2 mm long. Style 1.5 cm long. Fruits ellipsoid, 5–8 × 4–5 × 3.5–4 mm, pedicel of fruit persistent, not accrescent or slightly accrescent, 3–4 mm long. Pyrenes plano-convex, dorsal surface convex, with two adjacent parallel longitudinal crests, each 0.1 × 0.25 mm, curved, 0.4 mm apart along their length, forming a longitudinal groove from apex to base between the two crests; ventral surface concave, central part slightly elevated, margin with an endocarpal outgrowth 0.7 mm wide, with a groove between the edge of endocarp and endocarpal outgrowth 0.2 mm wide. Raphal opening at base of the endocarpal outgrowth, round, 0.2 mm in diameter, 0.2–0.3 mm from the edge of the pyrene wall, apex with a bony spine, spine triangular, erect, 0.5 × 0.2 mm. PGS not detected. Seeds light brown, hemi-ellipsoid, slightly crested at central part of dorsal side, 4.5 × 0.7 mm.

Distribution, habitat

Borneo: Malaysia, Sabah, around Ranau and Tambunan. Hill forest, stream valley, rocky moist slopes, alt. 125–1300 m.

KEP

Forest Research Institute Malaysia

SAN

Forest Research Centre

K

Royal Botanic Gardens