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Ammannia Linn., Sp. P1. 119. 1753. Gen. Pl. ed. 5:55.1754; D.A. Webb in Tutin et al, l.c. 302; Pol. & Rech. f. in Rech. f., l.c. 7; Chamberlain in Davis, l.c. 179.
Annual herbs, hygrophilous, glabrous. Stem ± quadrangular. Leaves opposite or whorled, rarely allernate. Inflorescence axillary, biparous cymes or glomerules. Flowers (4-)5-merous, subsessile or pedicellate, 2-bracteolate; bracteoles much shorter than flower. Hypanthium ± membranous in fruit. Epicalyx represented by mere folds, obscure or absent, rarely prominent. Petals 0-4, longer than sepals, caducous. Ovary globose, style absent or short. Capsule included or exceeding the hypanthium, globose, irregularly circum¬scissile.
Species c. 30. Cosmopolitan. 4 or 5 species occur in Pakistan. Petals are minute and often caducous, hence sometimes may be mistaken for its absence in flower.
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| 1 |
Leaves ± scabrid above. Hypanthium ± quadrangular,
top-shaped. Epicalyx prominent. Calyx ± scabrid.
Capsule shorter than calyx |
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Ammannia verticillata |
| + |
Leaves glabrous. Hypanthium not quadrangular, ±
campanulate. Epicalyx minute or obscure. Calyx
glabrous. Capsule ± equalling the calyx |
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(2) |
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| 2 (1) |
Leaves attenuate or upper ones ± rounded at the base. Cymes ± sessile, dense. Flowers subsessile or
sessile. Hypanthium not ribbed. Style 0-0.5 mm long |
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Ammannia baccifera |
| + |
Leaves ± auriculate at the base. Cymes pedunculate,
lax. Flowers pedicellate. Hypanthium ribbed. Style 1-2 mm long |
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(3) |
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| 3 (2) |
Calyx erect in fruit. Petals up to 2 mm long, 2 mm
broad. Capsule 2-3 mm in diameter |
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Ammannia auriculata |
| + |
Calyx reflexed in fruit. Petals up to 1 mm long, 0.75
mm broad. Capsule 1-1.5 mm in diameter |
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Ammannia multiflora |
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Lower Taxa
Related Synonym(s):
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