St Thomas Prickly Ash

Zanthoxylum thomasianum Krug & Urban (; Urban, Bot Jahrb. 12: 583, as synonym. 1896).
Fagara tliomasiana Krug & Urban ; Urban, Bot. Jahrb. 21 : 583. 1896.
A shrub; young branches minutely papillose, in drying angled; flowering branches and leaves prickly ; prickles at the base of the petioles paired, stipular, solitary or wanting, .Part 3, 1911] RUTACEAE 183
those of the branches becoming grayish ; petioles subterete, the rachis narrowly channeled ; leaves odd-pinnate ; leaflets 5-9, the lateral opposite, subsessile, orbicular or ovoid, the terminal one obovate and short-petioluled, 1.5-2.5 cm. long, 1.3-2 cm. broad, rounded or subtruncate and apiculate or very short-acuminate at the apex, obtuse or rounded at the base, subequilateral, obsoletehcrenate or nearly entire, rigid, chartaceous-coriaceous, shining on both sides ; glands inconspicuous or obsolete, scattered beneath, those between the crenatures pellucid ; inflorescence lateral, sessile, glomerate, few-flowered ; bracts ovate ; staminate flowers : sepals 3, in aestivation but little imbricate, distinct, short-ovate or ovate-rounded, obtuse, about 1 mm. long, glandular-thickened on the back near the apex; petals 3, cochleate-imbricate, spreading at flowering time, short-oval, 2.5-3 mm. long, 2 mm. broad, 3 times as long as the sepals ; stamens 3; filaments as long as or scarcely longer than the petals; anthers ovate ; gynophore convex, wrinkled, 3-lobed ; carpels 2, rudimentary, very small, almost immersed in the gynophore ; style short, sometimes a little thickened at the apex; pistillate flowers: gynoecium 3-carpellary ; follicles 3, sometimes 2 or 1 abortive, ovoid, 7-S mm. long, 5 mm. broad ; seeds ovate, 5 mm. long, 4 mm. broad, black, shining.
Type locality : In forests of FlagHill, St. Thomas.
Distribution : Known only from the type locality.

Zanthoxylum punctatum, also known as the St. Thomas prickly-ash, is a species of plant in the family Rutaceae. It is found in Puerto Rico, the British Virgin Islands, and the United States Virgin Islands. Its natural habitats are tropical and subtropical dry broadleaf forests and shrublands. It is threatened by habitat loss, and is the only on St. John listed as "endangered".