taxonID	type	description	language	source
F60C74288D265BA688CDA451642C0672.taxon	description	Figs 4, 5	en	Boonprajan, Punvarit, Oncham, Saruta, Sirichamorn, Yotsawate (2025): Derris longiracemosa (Fabaceae), a new species from Thailand with extraordinary limestone adaptations and the longest inflorescences ever recorded. PhytoKeys 261: 13-32, DOI: 10.3897/phytokeys.261.156249
F60C74288D265BA688CDA451642C0672.taxon	diagnosis	Diagnosis. The species exhibits several morphological traits that distinguish it from the coexisting species Derris solorioides. The texture of the leaflets is subcoriaceous to coriaceous (compared to chartaceous in D. solorioides). The leaflet apices are more emarginate. The inflorescences are clearly pseudoracemose or pseudopaniculate with brachyblasts (vs. a true panicle without brachyblasts in D. solorioides). These inflorescences can reach up to 155 cm in length, making them the longest recorded in the genus. The peduncle, rachis, and lateral branches of the inflorescence – including brachyblasts, pedicels, and calyces – are pubescent (as opposed to almost glabrous in D. solorioides). The number of flowers per brachyblast is also highest, with up to 16 flowers. Petal color changes during maturation, ranging from pure white to pink. The ovary contains fewer ovules, with 1 to 4 ovules (vs. ca. 8 in D. solorioides). Additionally, the flowering time is slightly earlier, occurring from November to December (vs. January to February in D. solorioides).	en	Boonprajan, Punvarit, Oncham, Saruta, Sirichamorn, Yotsawate (2025): Derris longiracemosa (Fabaceae), a new species from Thailand with extraordinary limestone adaptations and the longest inflorescences ever recorded. PhytoKeys 261: 13-32, DOI: 10.3897/phytokeys.261.156249
F60C74288D265BA688CDA451642C0672.taxon	description	Description. Woody climber, bark thin, smooth, pale greyish-brown; twigs glabrous or thinly hairy, lenticellate. Stipules caducous, triangular, 1.7 – 2 by 1.6 – 2 mm, outside glabrescent, margin fimbriate, inside glabrous. Leaves subcoriaceous to coriaceous; petiole 4.7 – 13 cm long, grooved above, glabrous or with some scattered hairs, rachis 4 – 24.5 cm long; pulvinus 6 – 9 mm long. Leaflets 5 – 7; petiolules 4 – 10 mm long; stipels absent; terminal one elliptic to obovate, 7.5 – 17.5 by 5 – 11 cm, base cuneate to round, apex usually emarginate, upper surface and lower surface glabrous, midrib flat or slightly raised above, distinctly raised below, veins flat above, raised below, lateral veins 7 – 12 pairs, 10 – 30 mm apart, not reaching the margin but curving towards the apex, sometimes anastomosing near the margin, venation reticulate; lateral ones elliptic, ovate, or obovate, 9 – 15 by 4.5 – 7 cm, base broadly cuneate to obtuse, apex shortly emarginate or round, rarely shortly acuminate, upper and lower surface glabrous. Inflorescences axillary or terminal, pseudoracemes / pseudopanicles, 44 – 155 cm long, pubescent; peduncle 4 – 11 cm long, pubescent; lateral branches 23 – 45 cm long; bracts subtending brachyblasts ovate to triangular, 0.8 – 1 by 1.2 – 1.5 mm, outside thinly pubescent and densely pubescent at base, inside glabrous, margin fimbriate. Brachyblasts knob-like to cylindrical, 3 – 12 mm long, pubescent, with 9 – 16 flowers throughout; floral bracts ovate or triangular, ca. 1 by ca. 0.6 mm, outside thinly pubescent and densely pubescent at base, inside glabrous, margin fimbriate; pedicels 4 – 9 mm long, pubescent; bracteoles at calyx base, ovate or triangular, 0.9 by 0.55 – 0.65 mm, outside pubescent, inside glabrous. Calyx reddish or with greenish tinge, cup-shaped, 3.5 – 4 mm high, outside pubescent, inside glabrous; tube ca. 2 mm long, upper lip with 2 short triangular lobes, 1.5 by 1.5 mm; lateral lobes triangular, 1.5 – 2 by 1.4 – 1.8 mm; lower lobe triangular, 1 – 1.3 by ca. 2 mm. Flower fragrant. Corolla white, gradually turning pink during maturation; standard white or pale pinkish with light green central patch, broadly obovate or orbicular, 7 – 10 by 7 – 7.5 mm, apex emarginate, basal callosities absent, outside and inside glabrous, claw 2 – 2.5 mm long; wings white or pale pinkish, oblong, 5.5 – 6.3 by ca. 3 mm, apex rounded, outside and inside glabrous, upper auricle 0.5 – 0.75 mm long, lower auricle indistinct, claw 3.2 – 4 mm long; keel white or pale pinkish, boat-shaped, 5.5 – 6.5 by 2 – 3.5 mm, apex rounded, outside glabrous or thinly ciliate at apex, inside glabrous, upper auricle 0.75 – 1 mm long, lateral pocket 1 – 2 mm long, claw 2.5 – 3.5 mm long. Stamens 8 – 11 mm long, free part of filaments 3.5 – 5 mm long, glabrous; anthers 0.3 – 0.5 by 0.3 – 0.4 mm, glabrous. Disc indistinct or annular, up to 0.3 mm long. Ovary up to 10 mm long, 1 – 4 - ovuled, pubescent; style ca. 4.5 mm long, glabrous but thinly pubescent at base. Pods elliptic, oblong, or sometimes strap-like, 5 – 9.5 by 2 – 3.5 cm, thin, with a wing along both sutures, upper wing 1 – 5 mm wide, lower wing 0.5 – 2 mm wide, young pod reddish and gradually turning to light green during maturation, dry pod light brown, glabrescent, seed chamber indistinct but usually slightly darker around the seed. Seeds 1 – 3, discoid or bean-shaped, 9 – 15 by 6 – 10 by 2 – 3 mm; hilum central ca. 2 mm long.	en	Boonprajan, Punvarit, Oncham, Saruta, Sirichamorn, Yotsawate (2025): Derris longiracemosa (Fabaceae), a new species from Thailand with extraordinary limestone adaptations and the longest inflorescences ever recorded. PhytoKeys 261: 13-32, DOI: 10.3897/phytokeys.261.156249
F60C74288D265BA688CDA451642C0672.taxon	etymology	Etymology. The specific epithet highlights the species’ distinction of possessing the longest inflorescence ever documented within the genus.	en	Boonprajan, Punvarit, Oncham, Saruta, Sirichamorn, Yotsawate (2025): Derris longiracemosa (Fabaceae), a new species from Thailand with extraordinary limestone adaptations and the longest inflorescences ever recorded. PhytoKeys 261: 13-32, DOI: 10.3897/phytokeys.261.156249
F60C74288D265BA688CDA451642C0672.taxon	distribution	Distribution. Endemic to Southwestern Thailand: Ratchaburi (type, Wat Khao Chong Phran, Photharam District), Phetchaburi (Kaeng Krachan National Park: Kaeng Krachan Dam Rope Bridge, Khao Pakarang, and vicinity of Ban Krang Substation) (Fig. 6).	en	Boonprajan, Punvarit, Oncham, Saruta, Sirichamorn, Yotsawate (2025): Derris longiracemosa (Fabaceae), a new species from Thailand with extraordinary limestone adaptations and the longest inflorescences ever recorded. PhytoKeys 261: 13-32, DOI: 10.3897/phytokeys.261.156249
