Goniothalamus sukhirinensis
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Leeratiwong2021PhytoKeys184, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Leeratiwong2021PhytoKeys184">{{Citation See also the citation download page at the journal. |
Ordo: Magnoliales
Familia: Annonaceae
Genus: Goniothalamus
Name
Goniothalamus sukhirinensis Leerat., Chalermglin & R.M.K.Saunders sp. nov. – Wikispecies link – Pensoft Profile
Diagnosis
Goniothalamus sukhirinensis resembles G. macrophyllus and G. scortechinii, but is distinguished by its densely hairy shoots, numerous secondary veins (32–40 pairs per leaf), generally longer pedicels (flowering: 12–18 mm; fruiting: 20–25 mm), larger outer petals (34–37 by 18–22 mm), larger monocarps (20–27 by 9–13 mm) that are densely hairy, and longer seeds (13–17 mm).
Types
Thailand: Narathiwat: Sukhirin, Ban Yade village, Ma Mong subdistrict, 167 m alt., 6 March 2021, C. Leeratiwong 21–1708 (holotype PSU; isotypes BKF, KKU).
Description
Shrubs to small trees, to 4 m. Young branches densely appressed-pubescent. Leaf laminas 28–50 by 7–16 cm, length/width ratio 3.1–4, (lanceolate-)oblong, apex generally acuminate to caudate (rarely acute to obtuse), acumen 7–20 mm long, base broadly cuneate, subcoriaceous, glabrous abaxially (sparsely hairy over midrib), sparsely pubescent adaxially (densely hairy over veins); midrib strongly prominent abaxially, sunken adaxially; secondary veins 32–40 pairs, plane adaxially; tertiary veins percurrent, distinct, lacking a ‘granular’ appearance abaxially; petioles 20–30 mm by 4–6 mm, densely pubescent. Flowers solitary or paired, often on main trunk (cauliflorous), rarely on older branches (ramiflorous), pendent; flowering pedicels 12–18 mm long, densely hairy; pedicel bracts ovate-triangular, 2.5–3 by 1–1.5 mm. Sepals greenish-pink, broadly ovate, 7–9.5 by 7.5–10 mm, basally connate (2.5–3 mm from base), apex acute, moderately hairy abaxially, sparsely hairy adaxially, venation indistinct. Outer petals greenish-yellow when young, whitish-yellow (green at claw) when mature, 34–37 by 18–22 mm with 3–5 mm-long claw, length/width ratio 1.6–1.9, fleshy, (lanceolate-)ovate, apex acuminate, densely hairy abaxially, moderately hairy adaxially with velutinous basal region facing apertures between inner petals, midrib raised adaxially, venation indistinct ab- and adaxially. Inner petals 13–15 by 7–8 mm with 2–3 mm long claw, length/width ratio 1.8–1.9, ovate-lanceolate, densely hairy abaxially, sparsely hairy distally adaxially, yellowish-green when young, pinkish-orange to reddish-brown when mature, apex acuminate, lacking a glabrous lasteral flange on the inner petal claws. Stamens numerous, oblong, 2.5–3.7 mm long; connectives apiculate, papillate. Carpels 11–20 per flower, ovary oblong, 2–3 mm long, with white hairs; stigma and pseudostyle 2–2.5 mm long, stigma funnel-shaped, hairy. Fruits sometimes with persistent calyx, immature fruits brownish-green, mature fruits not seen; fruiting pedicels 20–25 by 2–3.5 mm, sparsely hairy. Monocarps 5–14 per fruit, single-seeded, 20–27 by 9–13 mm, length/width ratio 2–2.7, (obovoid-)ellipsoid, apex apiculate, apicule 5–8 mm long, smooth, densely hairy, glossy, pericarp 1–2 mm thick, stipes 7–15 by 2–3 mm, densely hairy. Seeds 13–17 by 8–10 mm, length/width ratio 1.6–1.7, ellipsoid, testa densely villose, slightly rugose.
Phenology
Flowering and fruiting in February and March (based on limited data).
Distribution and habitat
Endemic to Narathiwat Province, Peninsular Thailand (Fig. 4). Growing in shady and moist areas of tropical rainforests; 167–200 m alt.
Etymology
From the name Sukhirin, Narathiwat Province.
Local name
Ratchakhru khao (ราชครูขาว) (Narathiwat).
Additional specimen examined (paratype)
Thailand: Narathiwat Province: Sukhirin District, Ban Yade village, Ma Mong subdistrict, 200 m alt., 28 February 2021, C. Leeratiwong 21–1707 (PSU).
Discussion
As with the previous species, G. sukhirinensis is yet to be included in a molecular phylogenetic analysis but has strong morphological affiliations with a clade that comprises G. loerzingii R.M.K.Saunders, G. macrophyllus, G. scortechinii, G. uvarioides and G. wrayi King (nested within clade ‘A1a’ sensuTang et al. 2015a[1], b[2]). The morphological characteristics of this clade are detailed under G. roseipetalus, above.
Goniothalamus sukhirinensis resembles G. macrophyllus and G. scortechinii, but differs in several key characters: densely hairy shoots (vs glabrous to medium-hairy); numerous secondary veins (32–40 pairs per leaf, vs 12–23 in G. macrophyllus and [18–]21–26[–32] in G. scortechinii); generally longer flowering pedicels (12–18 mm, vs 5–11.5 mm in G. macrophyllus and 8–13 mm in G. scortechinii); larger outer petals (34–37 by 18–22 mm, vs 10–28 by 4.5–11.5 mm in G. macrophyllus and 20–33 by 8–14 mm in G. scortechinii); longer fruiting pedicels (20–25 mm, vs 7–19 in G. macrophyllus and 8–20 mm in G. scortechinii); larger monocarps (20–27 by 9–13 mm, vs 8–15 by 7.5–10 mm in G. macrophyllus and 9–18 by 6–10 mm in G. scortechinii) that are densely hairy (vs subglabrous to medium-hairy); and longer seeds (13–17 mm, vs 8.5–12 mm in G. macrophyllus and 8–11 mm in G. scortechinii). Goniothalamus sukhirinensis also differs from G. macrophyllus as its leaves lack the fine ‘granular’ appearance of the latter species (due to the immersion of tertiary and higher-order veins: Saunders, 2002), and has longer monocarp stipes (7–15 mm, vs up to 1.8 mm in G. macrophyllus).
Original Description
- Leeratiwong, C; Chalermglin, P; Saunders, R; 2021: Goniothalamus roseipetalus and G. sukhirinensis (Annonaceae): Two new species from Peninsular Thailand PhytoKeys, 184: 1-17. doi
Images
|
Other References
- ↑ Tang C, Thomas D, Saunders R (2015a) Molecular phylogenetics of the species-rich angiosperm genus Goniothalamus (Annonaceae) inferred from nine chloroplast regions: Synapomorphies and putative correlated evolutionary changes in fruit and seed morphology.Molecular Phylogenetics and Evolution92: 124–139. https://doi.org/10.1016/j.ympev.2015.06.016
- ↑ Tang C, Thomas D, Saunders R (2015b) Molecular and morphological data supporting phylogenetic reconstruction of the genus Goniothalamus (Annonaceae), including a reassessment of previous infrageneric classifications.Data in Brief4: 410–421. https://doi.org/10.1016/j.dib.2015.06.021
