Pilea cavernicola

General description: 

Herb to 50 cm, terrestrial. Stems erect, drying brown, maroon to green when fresh, glabrous or pubescent at the nodes and towards the base, where pubescent the hairs 1.0 mm, erect, crooked, cystoliths fusiform, the internodes 23–300 × 1.5–2.5 mm, angulate to square in cross-section, striate. Stipules 2.5–4.0 mm, auriculate-ovate, drying brown. Leaves petiolate, distichous; petioles at each node subequal or unequal by ratio 1:1.1–2.8, 12–33 mm, pubescent or glabrous, where pubescent the hairs 1.0-1.25 mm, erect, weakly curved or crooked; laminae at each node equal or subequal, 26–90 × 12–46 mm, ovate, subchartaceous; 3-nerved, the lateral nerves visible for 2/3 or more of the lamina length, secondary nerves 7–11 pairs, borne 60–75° to the midrib, weakly curved; upper surface drying dark brown, green or bronze when fresh, glabrous, cystoliths densely scattered, less than 0.125 mm, elliptic and punctiform, midrib and secondary nerves sunken; lower surface drying brown to dark brown, pale green or flushed bronze-purplish when fresh, pubescent, the hairs 0.75–1.0 mm, appressed, weakly curved, eglandular; base symmetrical, cuneate or weakly decurrent; margin serrate, the basal 1/8–1/4 entire; apex symmetrical, cuspidate. Inflorescences 4–8 per stem, unisexual, staminate and pistillate inflorescences synchronous, born on separate stems; bracts 0.75 mm; bracteoles 0.5 mm. Staminate inflorescences 2 per axil, 17–22 mm, bearing 45–90 flowers in a loose cyme; peduncle 1/4 or less inflorescence length, 0.75 mm in diameter, glabrous, occasionally with cystoliths present; pedicels 0.50–1.5 mm, glabrous. Staminate flowers 1.5 × 1.5 mm immediately prior to anthesis, green-brown; tepals 4, 1.75 mm, valvate, fused for their basal 1/3, elliptic, glabrous, the subapical appendage less than 0.25 mm, corniculate, glabrous; stamens 4. Pistillate inflorescences 1 or 2 per axil, 8–13 mm, bearing 150–300 flowers in a loose cyme; peduncle 1/4 to 1/3 inflorescence length, 0.75 mm in diameter, densely covered in cystoliths, cystoliths punctiform, glabrous; pedicels 0.25–0.75 mm, glabrous. Pistillate flowers 0.50–0.75 mm, tepals 3, unequal, glabrous, adaxial tepal 0.50–0.75 mm, oblong or ovate, the dorsal tepal appendage 0.50–0.75 mm, oblong, markedly thickened almost hood-like; the lateral tepals 0.375–0.50 mm, asymmetrically ovate. Infructescences 8–13 mm; peduncle 1/4 to 1/3 infructescence length; achenes 0.75× 0.675 mm, sub compressed, asymmetrically ellipsoid, the abaxial margin very narrowly thickened.



星期四, 2013-12-26 22:47 -- hrzhang
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith