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Genus Stackhousia Family Stackhousiaceae

Description: Annual or perennial herbs, stems striate and often woody near the base.

Inflorescence terminal racemes or spikes. Flowers usually in groups in axils of bracts. Hypanthium cup-shaped. Petals free at base, fused in the middle, distally free. Stamens 5, 3 long, 2 short, enclosed in the corolla tube; filaments as long as or longer than glandless anthers; pollen reticulate. Ovary of 3–5 carpels; style without membranous cup; stigmatic lobes 3–5, spreading.

Fruit a schizocarp; cocci 1–5, wingless or 3-winged, connected at base to column by short triangular point of attachment, leaving a triangular scar after shedding; wings lacking prominent transverse veins; style inserted between and shorter than mature cocci.


Herbarium
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Herbarium
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Distribution and occurrence: World: 14 species, Malesia, Micronesia, Australia, New Zealand. Australia: 13 species (12 species endemic), all States.

Text by A. K. Brooks
Taxon concept:

Taxa not yet included in identification key
Stackhousia clementii

 Key to the species 
1Flowers solitary, in uppermost leaf axils; prostrate herb, forming matsStackhousia pulvinaris
Flowers in terminal inflorescence, several- to many-flowered, erect herbs2
2Flowers arranged singly along the inflorescence axis; 1–3 bracts at each main inflorescence node3
Flowers in clusters of 1–6 along the inflorescence axis; 3–12 or more bracts at each main inflorescence node
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4
3Leaves spathulate, rounded at apex; cocci prominently wingedStackhousia spathulata
Leaves obovate to linear or lanceolate, acute; cocci not winged
                       Back to 2
Stackhousia monogyna
4Cocci pyriform to dumbbell-shaped, muricate at apex, with a prominent round basal cavity; leaves linear, 1–2.5 mm wideStackhousia muricata
Cocci obovoid, wrinkled to reticulate, rarely muricate at apex, the basal cavity lacking or shallow and ovate to narrow-triangular; leaves narrow-obovate to elliptic, 1.5–8 mm wide or reduced to scales
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5
5Leaves foliose, 1.6–7.5 mm wide, the basal ones sometimes reduced to scalesStackhousia viminea
Leaves reduced to scales, less than 1.6 mm wide
                       Back to 4
Stackhousia nuda

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