Pierre ex Pitard in Fl. Gén. I.-C. 3(2): 272. 1923.
Small trees or shrubs. Leaves opposite, petiolate, blades coriaceous; stipules interpetiolar, triangular, cuspidate. Inflorescences axillary and paired, consisting of much-congested, bracteolate many- to few-flowered cymes. Flowers 4(5)-merous, hermaphrodite. Calyx with a short basal tubular part and oblong-lanceolate lobes. Corolla hypocrateriform, tube hairy at the throat, about as long as the lobes, the latter contorted in bud, spreading to reflexed in open flowers. Stamens inserted at the throat; anthers subsessile, exserted. Ovary 2-celled, each locule with 3-4 collateral ovules attached to an apical placenta; style with 2-lobed stigma about as long as corolla tube. Fruit a berry-like drupe with thin endocarp, crowned by persistent calyx lobes; each locule with typically 3 seeds.
A small, ill-known genus of 2 species confined to Indochina and Thailand. Apparently (very) close to Hypobathrum (see p. 000) [and Hyptianthera (see p. 000)] and perhaps not to be upheld; detailed investigations of both genera are needed.— Classification: subfamily Ixoroideae, tribe Coffeeae.
Key to the species
1. Leaves to 7 cm long, petioles to 3 mm long; fruit globose, to 6 mm in diam.
1*. Leaves 8-15 cm long, petioles 5-10 mm long; fruit ovoid, c. 10 mm high
1. Xantonnea parvifolia (Kuntze) Craib in Fl. Siam. En. 2(1): 130. 1932.— Discospermum parvifolium Kuntze, Rev. Gen. Pl. 1: 280. 1891.— Tricalysia parvifolia (Kuntze) Merr., Brittonia 2: 198. 1936.— Xantonnea coffeoides Pierre ex Pitard in Fl. Gén. I.-C. 3(2): 271. 1923.— Xantonnea coffeoides var. salicifolia Pierre ex Pitard in Fl. Gén. I.-C. 3(2): 272. 1923.
Shrub to 4 m tall, often much-branched; youngest parts shortly pubescent, soon becoming glabrous. Leaves thinly coriaceous, elliptic-oblong to linear-oblong, 4-7 by 1-3.5 cm, gradually narrowed to the base, apex acute to acuminate, glabrous; 7-9 pairs of lateral veins; petioles short, up to 5 mm long; stipules triangular, with a long apical awn, 4-9 mm long. Inflorescences axillary and paired, consisting of much-congested, dense, subsessile, bracteose, several-flowered cymes. Flowers 4-merous, fragrant. Calyx tube < 0.5 mm high, lobes to 1 mm long, elliptic. Corolla white to creamy-white, tube c. 2.5 mm long, hairy at the throat, lobes to 3.5 mm long, obtuse. Stamens subsessile, anthers c. 1.5 mm long, at least partly exserted. Ovary to c. 1 mm high; style plus 2-lobed stigma to c. 3 mm long. Drupe globose, c. 4-6 mm in diam., crowned by the persistent calyx lobes. Seeds 3-4 per locule, dorsally convex and ventrally concave, c. 3.5-4.5 by 3-4 mm.
T h a i l a n d.— EASTERN: Buri Ram, Roi Et, Ubon Ratchathani; central: Saraburi, Krung Thep Maha Nakhon (Bangkok; cultivated); SOUTH-EASTERN: Prachin Buri.
D i s t r i b u t i o n.— Laos, Cambodia, Vietnam (type).
E c o l o g y.— Evergreen forest along streams; riverbanks, edge of rice fields; sometimes associated with limestone. Altitude: 20–200 m.
V e r n a c u l a r.— ??.
t e s.— 1. Poorly
known and not recollected in recent years.
2. Possibly a facultative rheophyte (“var. salicifolia”); needs confirmation in the field.
Glabrous tree to 25 m tall. Leaves coriaceous, elliptic, oblong or oblanceolate, 8-15 by 3-5 cm, narrowed to the base, apex (shortly) acuminate; 6-7 pairs of lateral veins: petioles 5-10 mm long; stipules triangular, cuspidate, to c. 4 mm long. Inflorescences axillary and paired, consisting of dense clusters of subsessile flowers arranged in much-congested, bracteose, several-flowered cymes. Flowers 4-merous, only known from bud stage. Buds c. 3 mm long. Stamens subsessile. Ovary with 3 ovules per locule. Drupe ovoid, c. 10 mm high and 9 mm wide, crowned by the persistent calyx. Seeds 3 per locule, dorsally convex and ventrally flat or concave, c. 6-6.5 by 5 mm.
T h a i l a n d.— NORTHERN: Phitsanulok; SOUTH-EASTERN: Prachin Buri, Rayong.
D i s t r i b u t i o n.— Cambodia (type), Vietnam.
E c o l o g y.— Evergreen and semi evergreen forest. Altitude: ?–200–? m.
V e r n a c u l a r.— ??.
N o t e.— Poorly and incompletely known and not recollected in recent years.
 C. Puff