Pseudagrostistachys Pax And K.hoffm.

Genus

Angiosperms > Malpighiales > Euphorbiaceae

Characteristics

Dioecious shrubs or small trees with a simple indumentum (± confined to the inflorescences). Leaves alternate, petiolate, stipulate, stipellate or not, simple, entire, subentire or ± remotely and shallowly serrulate-denticulate, penninerved, with 2–4 glands at the top of the petiole or on the upper surface of the lamina at the base. Stipules fused into an elongate sheath, leaving a distinct ± annular scar on falling. Inflorescences axillary or cauliflorus, racemose, solitary or fasciculate, shortly pedunculate or not, ± lax-flowered, strobiliform when young; bracts broad, concave, ciliate, persistent, ♂’s 1–more-flowered, ♀’s usually 1-flowered; bracteoles 2. Male flowers pedicellate; pedicels articulate near the base; calyx closed in bud, later splitting into 2–5 membranous valvate lobes; petals 5–8, free, imbricate; receptacle convex, alveolate-glandular, pubescent; stamens 20–55, free, erect in bud, inserted in the receptacular alveoli, anthers apicifixed, extrorse, the thecae ± free and pendulous from a thickened glandular apiculate connective, longitudinally dehiscent; pistillode reduced or 0. Female flowers: pedicels stouter than in ♂, articulate near the base; calyx and petals ± as in the ♂; disc hypogynous, annular, thickened, alveolate; staminodes often present, filiform, resembling sterile stamens, arising from the alveoli of the disc; ovary 3-locular, with one ovule per locule; styles 3, ± free, bipartite, the style-arms papillose. Fruit 3-locular, dehiscing into 3 bivalved cocci; endocarp thinly woody; columella persistent. Seeds subglobose, ecarunculate; testa crustaceous, shiny; albumen thick, fleshy; embryo straight or slightly curved; cotyledons broad, flat.
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Inflorescences axillary or borne on old wood, racemose, solitary or fasciculate, shortly pedunculate or not, strobiliform at first, later laxly flowered; bracts broad, concave, ciliate, persistent; male inflorescences 1–more-flowered; female inflorescences usually 1-flowered; bracteoles 2.Male flowers pedicellate, pedicels jointed near the base; calyx closed in bud, later splitting into 2–5 membranous valvate lobes; petals 5–8, free, imbricate; receptacle convex, covered in contiguous disk glands, pubescent; stamens 20–55, free, erect in bud, arising from pits in the glandular surface, anthers fixed at apex, extrorse, the thecae almost free, pendulous from a thickened glandular apiculate connective, longitudinally dehiscent; pistillode reduced or absent.
Female flowers: pedicels stouter than in the male, jointed near the base; calyx and petals resembling those of the male; disk hypogynous, annular, thickened, alveolate; staminodes often present, filiform, arising from the alveoli; ovary 3-locular, with 1 ovule per locule; styles 3, almost free, bipartite, the stigmas papillose.
Leaves alternate, petiolate, stipulate, stipellate or not, simple, entire, subentire or remotely and shallowly serrulate-denticulate, penninerved, with 2–4 glands at the top of the petiole or on the upper surface of the lamina at the base.
Seeds subglobose, ecarunculate; testa crustaceous, shiny; albumen thick, fleshy; embryo straight or slightly curved; cotyledons broad, flat.
Fruit 3-locular, dehiscing into 3 bivalved cocci; endocarp thinly woody; columella persistent, apically tricornute.
Stipules fused into an elongate sheath, which on falling leaves a distinct annular scar.
Indumentum simple (± confined to the inflorescences).
Dioecious shrubs or small trees.
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Hardiness (USDA) 9-12

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Distribution

Pseudagrostistachys world distribution map, present in Congo, Ghana, Nigeria, Tanzania, United Republic of, Uganda, and Zambia

Identifiers

LSID urn:lsid:ipni.org:names:15824-1
WFO ID wfo-4000031335
COL ID 8W2RH
BDTFX ID -
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Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Pseudagrostistachys

Lower taxons

Pseudagrostistachys africana Pseudagrostistachys ugandensis