WEBERBAUERA Gilg & Muschler, Bot. Jahrb. Syst. 42: 481. 1909.
Ihsan A. Al-Shehbaz
Tribe: Thelypodieae Prantl in Engler & Prantl, Nat. Pflanzenfam. III. 2: 155. 1891.
Name derivation: For August Weberbauer (1871–1948), German botanist and explorer who collected extensively in Peru and became professor of botany at the University of San Marcos, Peru.
Type species: W. densiflora (Muschler) Gilg & Muschler (based on Braya densiflora Muschler; = W. spathulifolia (A. Gray) O. E. Schulz).
Herbs perennial, usually cespitose, with simple or branched woody caudex usually covered with petiolar remains of previous years. Trichomes simple or forked, short-stalked sessile and malpighiaceous. Multicellualr glands absent. Stems ascending, sometimes prostrate to decumbent, often simple. Basal leaves petiolate, rosulate and often terminate caudex branches, simple, entire or variously toothed to pinnately dissected; cauline leaves petiolate or sessile and cuneate to attenuate, not auriculate, entire or dentate. Racemes few- to several-flowered, bracteate or ebaracteate, corymbose, elongated in fruit; rachis straight; fruiting pedicels ascending to divaricate, persistent. Sepals ovate to oblong, free, deciduous or rarely persistent, erect orrarely spreading, equal, base of inner pair not saccate. Petals white, rarely violet, lavender or yellow, erect at base with flaring blade, longer than sepals; blade spatulate to oblong, apex obtuse; claw undifferentiated from blade or rarely distinct and glabrous, entire, unappendaged. Stamens 6, slightly exserted, erect, slightly tetradynamous; filaments filiform, wingless, unappendaged, not dilated at base, glabrous, free; anthers ovate to oblong, not apiculate at apex. Nectar glands confluent and subtending bases of all stamens; median nectaries present; lateral nectaries semiannular. Ovules 5-50 per ovary; placentation parietal. Fruit dehiscent, capsular siliques, linear to oblong, terete or slightly latiseptate or angustiseptate, not inflated, sessile or subsessile, unsegmented; valves papery, usually with a prominent midvein, glabrous or pubescent, not keeled and rounded, smooth or torulose, wingless, unappendaged; gynophore absent or rarely to 0.5 mm; replum rounded, visible; septum complete or rarely perforate, membranous, veinless; style obsolete or distinct and to 2.5 mm long, stout or filiform, persistent, glabrous; stigma capitate, entire, not appendaged. Seeds uniseriate or rarely subbiseriate, wingless, oblong, plump; seed coat minutely reticulate, not mucilaginous when wetted; cotyledons incumbent.
Twenty-one species: Argentina, Bolivia, Chile, Peru.
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