Psammogeton Edgew., Proc. Linn. Soc. 1: 253. 1845; Boiss., Fl. Or. 2: 1078. 1872; Clarke in Hook. f., Fl. Brit. Ind. 2: 719. 1879; Wagentiz, Die Gattung Psammogeton in Ber. Deutsch. Bot. Gesell. 69: 227-238. 1956; Hiroe, Umbel. Asia. 1: 37. 1958; Fl. Pak. @ eFloras.org

Plants annual. Leaves 1-2-pinnate. Bracts and bracteoles scarious, whitish, linear to lanceolate or oval. Rays 5-15. Calyx teeth obsolete. Petals white to rose coloured, bilobed. Fruit ovoid, densely hairy to hispid; primary and secondary ridges distinct, vittae solitary under the secondary ridges; commissure 2-vittate. Inner seed face plane to slightly concave.

15 species

Psammogeton canescens (DC. ex Boiss.) Vatke, Index Seminum (B, Berolinensis) 1876 (App.): 3. 1876; Fl. Pak. @eFloras.org; Athamantha canescens DC., Prodr. 4: 155. 1830; Pimpinella crinite Boiss., Ann. Nat. Bot. 3: 131. 1844; Psammogeton biternatum var. villosa Clarke in Hook. f., Fl. Brit. Ind. 2: 719. 1879; P. canescens subsp. canescens Wag., Die Gattung Psammogeton in Ber. Deutsch. Bot. Gesell. 69: 227-238. 1956; P. crinata Boiss., Fl. Or. 2: 1078. 1872.

Annual herbs, 10-45 cm tall, pubescent. Branches erect, ribbed, glabrous. Leaves 1-2-pinnate, up to 6 cm long, lower petiolate, petiole ca. 1.6 cm long, gradually reduced towards apex, upper sessile; ultimate segments lanceolate, abaxially pubescent. Inflorescence compound umbel; rays 5-10, up to 1.5 cm long; primary peduncle up to 6 cm long; involucre of 5 bracts, bracts 5-9 mm long, lanceolate, acuminate or subulate, white, pubescent. Involucel of 5-6 lanceolate to oval, white, pubescent bracteoles (or bractlets), 4-5 mm long, long mucronate. In an umbel, peripheral flowers are female and inner bisexual. Flowers small, ca. 2 mm across, light rosy or white. Pedicels up to 4 mm long in fruit, glabrous. Calyx obsolete. Petals 5, 1 mm x 1.25 mm, bilobed, light rosy or white. Stamens 5; filaments 1.3-1.5 mm long; anthers 0.3-0.5 mm long, oval or globular. Ovary inferior, 1 mm long, densely hairy, bilocular, each locule with 1 ovule; styles 2, swollen at base forming stylopodium; stigma minute. Fruit ovoid, densely hairy, hairs 1-1.5 mm long, glochidiate; fruit schizocarpic, consisting of 2 mericarps; mericarp usually with primary and secondary ridges; vittae solitary under the secondary ridges; inner seed face plane.

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