Allowissadula D.M. Bates
Contenido
Descripción
Erect or spreading subshrubs with soft or rough stellate pubescence, often with simple hairs, sometimes viscid. Leaves petiolate, the blades ovate or more or less 3- lobed, cordate, dentate, acute or acuminate, lacking foliar nectaries; stipules filiform or subulate, caducous. Flowers usually in terminal panicles; involucel absent; calyx 10-nerved, the lobes lanceolate; petals yellow-orange or white (fading rose), the claws ciliate, otherwise glabrous; staminal column included, glabrous, antheriferous at apex, pallid, the anthers numerous, frequently orange; styles 5, slender, the stigmas capitate. Fruits schizocarpic (but often functionally capsular), pubescent, 5-tobed, the lobes opposite the lobes of the calyx; mericarps 5, rounded or apiculate apically, more or less constricted below (sometimes also with an endoglossum) making two cells, the lower 1-seeded, the upper 2-seeded; seeds reniform, glabrous. Base chromosome number: x = 8.A
Discusión taxonómica
Nomenclatural problems surrounding the name Pseudabutilon and the taxonomic problems related to Fries’s conception of this genus made it necessary to fragment Fries’s conception of the genera Wissadula and Pseudabutilon, to reduce the name Pseudabutilon to synonymy (see following paragraph), and to propose a new name for the group treated here (Bates 1978a).
Hutchinson (1967) designated Pseudabutilon spicatum (H. B. K.) R. E. Fries as the lectotype species of Pseudabutilon R. E. Fries. I believe this choice is based on a misinterpretation. Fries (1908) established the genus Pseudabutilon on the basis of two previously described sections of the genus Wissadula: sect. Wissadulastrum Schumann (type: W. spicata) and sect. Abutilastrum E. G. Baker (type: W. scabra). Fries did not elevate either section to generic rank but coined the new name, Pseudabutilon, for the combined taxon; nor did he explicitly designate either section as “typical.” Therefore, the choice is open. However, he did segregate Pseudabutilon from Wissadula because of its resemblance to Abutilon, as is indicated in his formation of the name Pseudabutilon and in his statement (op. cit. p. 15) that the new genus “muss . . . einen neuen [Namen] erhalten, und wollen wir hier als solchen den Namen Pseudabutilon R. E. Fr. vorschlagen, damit thren Platz auch in der Nihe der Gattung Abutilon andeuten, . . . .” It therefore seems best in accord with Fries’s intent to consider sect. Abutilastrum as the nominate section, both because of the meaning of the sectional name and because of the morphology of the plants included in the section. The lectotype species, therefore, is here considered to be Pseudabutilon scabrum (K. Presl) R. E. Fries. So typified, Pseudabutilon is a synonym of Abutilon in the present treatment.
Allowissadula is a principally Mexican genus of nine species, two of which also occur in Texas.A
Hutchinson (1967) designated Pseudabutilon spicatum (H. B. K.) R. E. Fries as the lectotype species of Pseudabutilon R. E. Fries. I believe this choice is based on a misinterpretation. Fries (1908) established the genus Pseudabutilon on the basis of two previously described sections of the genus Wissadula: sect. Wissadulastrum Schumann (type: W. spicata) and sect. Abutilastrum E. G. Baker (type: W. scabra). Fries did not elevate either section to generic rank but coined the new name, Pseudabutilon, for the combined taxon; nor did he explicitly designate either section as “typical.” Therefore, the choice is open. However, he did segregate Pseudabutilon from Wissadula because of its resemblance to Abutilon, as is indicated in his formation of the name Pseudabutilon and in his statement (op. cit. p. 15) that the new genus “muss . . . einen neuen [Namen] erhalten, und wollen wir hier als solchen den Namen Pseudabutilon R. E. Fr. vorschlagen, damit thren Platz auch in der Nihe der Gattung Abutilon andeuten, . . . .” It therefore seems best in accord with Fries’s intent to consider sect. Abutilastrum as the nominate section, both because of the meaning of the sectional name and because of the morphology of the plants included in the section. The lectotype species, therefore, is here considered to be Pseudabutilon scabrum (K. Presl) R. E. Fries. So typified, Pseudabutilon is a synonym of Abutilon in the present treatment.
Allowissadula is a principally Mexican genus of nine species, two of which also occur in Texas.A