Graceful Pouzolz's Bush

Pouzolzia zeylanica was misidentified as Parietaria officinalis Linnaeus by J. K. Small.

A perennial, 20-40 cm tall, erect to suberect, hairy to glabrescent herb. Leaves opposite or rarely alternate, with 4-12 mm long petiole; lamina lanceolate-rhomboid ovate, 1-2.5 cm long, 4-15 mm broad, cuneate or subtruncate at the base, entire, acute; stipules broadly ovate, c. 4-5 mm long, c. 3-4 mm broad, acuminate, ciliate. Flowers pale green, in loose axillary clusters, covered with simple or uncinate hairs, female sessile, male with c. 2 mm long pedicel. Calyx 4-lobed and gibbous in male; 4-toothed in female flowers. Stamens 4. Achenes ovate, c. 1.5 mm long, shining black, enveloped by ribbed calyx.

Plants 1-20 dm, sparsely to moderately covered on all parts with appressed and spreading hairs. Leaf blades 1-5 × 0.6-2 cm, base rounded to broadly cuneate, apex acute or nearly acuminate. Staminate flowers ca. 3 mm across; filaments longer than tepals; pistillode elongate, knoblike. Pistillate flowers ca. 1-1.5 mm, tepals ribbed. Achenes ca. (0.9-)1.2 × ca. 0.6 mm, base truncate.

Herbs perennial, erect or ascending, rarely prostrate, almost simple or few branched at base, 12-40 cm tall; rootstock often tuberous; branches sometimes with short branchlets, strigillose. Leaves often opposite, sometimes alternate on lower or upper stems; stipules triangular, 2-6 mm; petiole 0.2-1.8 cm; leaf blade ovate or broadly ovate, lanceolate or narrowly lanceolate, usually 1.2-9 × (0.6-)0.8-3 cm, smallest ones on short branchlets, herbaceous, secondary vein 1 or 2 pairs, abaxial surface sparsely or sometimes densely strigillose or strigose along veins, adaxial surface glabrous or sparsely strigillose; base cuneate to rounded, rarely subcordate, margin entire, apex subobtuse, acuminate, or shortly so. Glomerules often bisexual, 2.5-5 mm in diam., bisexual ones in nodes of proximal leaves, female in distal axils; bracts triangular, 2-3 mm, ciliate. Male flowers: perianth lobes 4, narrowly oblong or oblong-oblanceolate, connate to middle, 1.2-1.5 mm, puberulent, apex acute or cuspidate. Female perianth tube ellipsoid or rhombic, 0.8-1 mm, 1.5-1.8 mm in fruit, puberulent, inconspicuously ca. 9-ribbed or 4-winged, apex 2-toothed. Achenes white, light to dark yellow or light brown, ovoid, 1-1.2 mm. Fl. Jul-Aug, fr. Aug-Oct.

Distribution: Pakistan, India, Sri Lanka (Ceylon), Burma, Malayasia and China.

S Anhui, Fujian, S Gansu, Guangdong, Guangxi, Hubei, Hunan, Jiangxi, Sichuan, Taiwan, E and S Yunnan, W Zhejiang [India, Indonesia, Japan, Kashmir, Malaysia, Myanmar, Nepal, Papua New Guinea, Pakistan, Philippines, Sri Lanka, Thailand, Vietnam; Australia, Maldives, Polynesia, Yemen (Socotra); introduced in Africa and the New World].

Himalaya, India, Ceylon, Burma, east to China and S. Japan, Malaysia.

introduced; Fla.; Asia.

200-2400 m

Fl.Per.: July-October.

Flowering late summer-winter.

Roadsides, old fields, waste places, disturbed areas; 0-20m.

Grasslands, thickets by streams, wet places, sunny and somewhat moist places by rice fields; 100-800(-1300) m.

Parietaria zeylanica Linnaeus, Sp. Pl. 2: 1052. 1753

Bọ mắm, cũng có tên là thuốc giòi, tên khoa học Pouzolzia zeylanica, là một loài thực vật có hoa trong họ Tầm ma, có dạng cây thảo mọc hoang. Loài này được (L.) Benn. & R. Br. mô tả khoa học đầu tiên năm 1838.

Cây bọ mắm mọc bò lan trên mặt đất ở những cánh đồng ẩm thấp, bản địa trải dài từ Ấn Độ và bán đảo Đông Dương xuống Malaysia và quần đảo Philippin.

Lá cây mỏng, hình trứng thon, nhọn đầu, dài 4–9 cm, ngang khoảng 2 cm. Mặt lá lốm đốm chấm trắng.

Hoa nhỏ nở thành chùm ở nách nhánh. Trái bọ mắm hình trứng nhọn có khía dọc như chia ra từng múi.

雾水葛（学名：Pouzolzia zeylanica），又稱：石薯仔、全緣葉水雞油、草本金石榴、石珠、啜膿膏、拔膿膏、膿見消、腫兒消、硃珠仔、台灣霧水葛，为荨麻科雾水葛属下的一个植物种。