SCHIZOPETALON Sims, Curtis Bot. Mag. 50: t. 2379. 1823.
Ihsan A. Al-Shehbaz
Tribe: Schizopetaleae R. Brown in Barnéoud, Ann. Mag. Nat. Hist. 16: 68. 1845.
Name derivation: Greek deeply cut petals.
Type species: S. walkeri Sims.
Synonyms: Perreymondia Barnéoud, Ann. Sci. Nat. Paris III. 3: 168. 1845. Type: P. dentata Barnéoud.
Herbs annual. Trichomes dendritic, stalked 1- or 2-forked, or rarely simple at stem base. Multicellular glands absent. Stems erect or rarely decumbent, simple or branched basally. Basal leaves petiolate, usually not rosulate, simple, pinnatifid to pinnatisect, rarely bipinnatisect or sinuate-dentate; cauline leaves petiolate, similar to basal ones but progressively smaller upward. Racemes several flowered, bracteate throughout or only basally, or ebaracteate, corymbose, often elongated considerably in fruit; rachis straight or rarely flexuous; fruiting pedicels suberect, divaricate, or reflexed, persistent. Sepals oblong-linear, connivent, free, deciduous, erect, equal, base of inner pair not saccate. Petals white, erect at base with flaring blade, longer than sepals; blade obovate in outline, pinnatifid with 7-9 linear to narrowly oblong lobes, involute in bud; claw strongly differentiated from blade, longer than sepals, glabrous, unappendaged, entire. Stamens 6, included, erect, slightly tetradynamous; filaments wingless, unappendaged, glabrous, free, not dilated at base; anthers linear, not apiculate at apex. Nectar glands 4, 1 on each side of lateral stamen; median glands absent. Ovules (8-)20-50(-85) per ovary; placentation parietal. Fruit dehiscent, capsular siliques, linear, terete, 4-angled, or slightly latiseptate, not inflated, unsegmented; valves papery, with a prominent or obscure midvein, glabrous or pubescent, not keeled, torulose, wingless, unappendaged; gynophore absent or to 1 mm; replum rounded, visible; septum complete, membranous, veinless; style obsolete to 8 mm, cylindric, persistent, glabrous or pubescent; stigma capitate or sagittae, 2-lobed or subentire, lobes decurrent, unappendaged. Seeds uniseriate or rarely biseriate, wingless, oblong, ovate, or globose, plump or sligtly flattened; seed coat minutely reticulate, not mucilaginous when wetted; cotyledons incumbent or spirally coiled, oblong or linear, entire or bifid to base. x = 10.
Ten species: Chile, with the range of one extending into Argentina.
Reference: Al-Shehbaz (1989).
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