Aquatic Plants

Bolboschoenus caldwellii
​      Sea Club-Rush
Wetland Planting Zone
Shallow Marsh/Deep Marsh
Approved Format
600cc
Family
Cyperaceae
Form
Bolboschoenus caldwellii is a perennial sedge between 30-90cm tall
Foliage
The leaves are arranged alternately along the stem. They have long, closed, leathery sheaths with spreading blades up to about 35cm long and 5mm wide tapering into a point
Flowers
The seed heads are compact heads of 2-6 spikelets (units) near the stem tip, chestnut brown in colour
Fruit
Nut lenticular with concave faces, broad-obovoid, 3.5-4mm long, 2.5-3mm diameter, straw-coloured to dark golden brown, shining
Habitat
Occasional, in swamps or inland along artesian bore drains
Distinctive Features
More slender than the other species, usually with leaves erect, with a small clustered inflorescence, and the nut broad and always lenticular, with surface minutely but obviously reticulate under a hand lens
Similar Species
Shorter stems than Bolboschoenus medianus and Bolboschoenus fluviatis
Comments
Tolerates brackish conditions, useful for upper reaches of estuarine water bodies

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