Bourreria P.Browne

Strongbark (en)

Genus

Angiosperms > Boraginales > Boraginaceae

Characteristics

Trees or shrubs, glabrous or tomentose-pubescent. Leaves alternate or subverticellate, obovate-oblong, rarely acuminate, smooth or scabrid above. Flowers small to quite large (up to 5 cm. long), few to many in lax dichotomous corymbose cymes, rarely solitary. Calyx globose or ovoid in bud, closed, splitting into 2–5 valvate teeth or lobes which are sometimes irregular and often cohering, tomentose inside. Corolla-tube short or elongate-cylindrical, often broadened at the throat; lobes 5, ovate or broadly ovate, obovate or cordate, spreading, imbricate. Stamens 5, inserted in the tube, included or exserted; filaments filiform, short; anthers ovate or oblong. Ovary 4-locular; style terminal, bifid, or entire in a few species; stigmas truncate, capitate or clavate; ovules lateral, affixed above or below the middle. Drupes subglobose, small or quite large, up to 2.5 cm. diameter; endocarps ± 4-angled, splitting into 4 bony 3-angled pyrenes with ridged or winged outer faces; central column splitting into 4 erect branches with pyrenes finally suspended from the apices or ± adnate to internal angle of pyrenes or entirely obsolete; seeds laterally affixed; albumen sparse to fairly copious, fleshy.
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Trees or shrubs. Leaves alternate, rarely almost whorled, simple, mostly lanceo-late or elliptic; petiolate. Inflorescences cymes, open and many-flowered or occasion-ally few-flowered. Flowers perfect, ? actinomorphic, sessile or pedicellate; calyx campanulate, closed in bud, 2-5-lobed; corolla funnelform to salverform, 5-lobed, the lobes frequently rounded; stamens 5, included or exserted, borne on the corolla throat, subsessile or the filaments only shortly free, the anthers narrow to broadly oblong; ovary ovoid, unlobed, 2-or incompletely 4-locular, the style bifid near the apex, the stigmas 2 and capitate or peltate. Fruit drupaceous, ? spherical, the pericarp thin, enclosing 4 nutlets.
Stamens 5, inserted on the corolla tube, sometimes about the middle, included or exserted; anthers oblong on short filaments.
Inflorescences paniculate or corymbose, sometimes few-flowered, terminal but sometimes apparently lateral.
Fruit drupaceous, subglobose; pyrenes 4, bilocular, 1-seeded, the outer surface with thin woody lamellas.
Style terminal on the ovary, entire or very shortly bifid; stigmas 2, capitate or peltate, or 1, bilobed.
Corolla tube usually campanulate; lobes 5, frequently rounded, spreading or reflexed.
Leaves alternate, sometimes crowded, petiolate, simple, usually entire.
Flowers hermaphrodite, actinomorphic, subsessile or pedicellate.
Calyx campanulate, closed in bud, 2–5-lobed.
Trees or shrubs.
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Hardiness (USDA) 9-12

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