J Syst Evol ›› 1965, Vol. 10 ›› Issue (1): 91-102.

• Research Articles • Previous Articles     Next Articles

Genera Nova vel Minus Cognita Familiae Compositarum, II. Cavea W. W. Smith et Small et Nannoglottis Maxim

Ling Yong, Chen Yi-Ling   

  • Published:1965-01-17

Abstract: The present paper is an attempt to throw some light on two Composite genera, Cavea W. W. Smith et Small and Nannoglottis Maxim., of which the generic features and the systematic position were heretofore rather badly known. Cavea, a monotypic genus based upon Saussurea salwinensis Drumm., was described by W. W. Smith and Small as monocious. From the ample material now in our command, it is found that the genus is either monocious and dioecious, the capitula in the latter case being homogamous. The individuals exclusively provided with sterile flowers are usually smaller in size, sometimes even stemless. Such repartition of sexes was known in the subtribe Plucheinae (tribe Inuleae), to which W. W. Smith and Small were correct to ascribe their genus. Nannoglottis was considered by Maximovicz as un abnormal genus of the tribe Inuleae, having heterogamous capitula with one series of peripheric fertile ligulate pistillate flowers. Having examined the type specimen of N. carpesioices Maxim. and the extensive collection from Kansu and Tsinghai, we incline to say that the genetic characters as discerned by Maximovicz are doubtlessly due to his inaccurate observation. The flowers of Nannoglottis are in fact trimorphous, of which the pistillate ones are 2-3-seriate, the outer being shortly ligulate and the inner, short-tubulate with truncate apex. Handel-Mazzetti, much later, indicated that, in another species, the pistillate flowers are 2-3-seriate, but no mention was made about the inner tubulate pistillate flowers. Franchet, appearing to be unware of Maximovicz's genus, founded his Stereosanthus Franch. and considered it as a genus intermediate between the tribes Inuleae and Senecioneae. The genus was misinterpreted by Franchet as having dimorphous flowers, the pistillate ones being all ligulate. Curious enough, one of the major generic features, viz., the presence of inner tubulate pistillate flowers, was neglected by all early botanists and was first recognized by Handel-Mazzetti fourty years later. However, Handel-Mazzetti was still unacquainted with the characters of Nannoglottis and proposed therefore his new genus Vierhapperia Hand.-Mzt. on the reason that the flowers are trimorphous. Moreover, he compared his genus with Conyza L. and Erigeron L. of the tribe Astereae, but the characters marked by him appear not to be different from those of Nannoglottis. From the above morphological comparaison, it is evident that Nannoglottis and two other genera in question possess in common important characters in the general appearance, the flower-forms and the structure of achenes and pappus. The differences in the disposition of involucral bracts and the length of ligules are criteria good for separating species, but can hardly be regarded as sufficient for generic delimitation. Moreover, these three genera are almost similar in their geographical distribution. These points are adequate to warrant that Stereosanthus and Vierhapperia are in reality congeneric with Nannoglottis. Nannoglottis appears to have been correctly placed by Hoffmann in the subtribe Senecioninae (tribe Senecioneae) though in that subtribe it finds no close relatives. On account of the outstanding characters of the genus, a further study of its systematic position is required. The present paper is brought to close by a tentative scheme of classification of the genus so amplified, of which two sections, namely, sect. Stenolepis Ling et Y. L. Chen (Stereosanthus Franch., p. p. min.) and sect. Nannoglottis (Stereosanthus Franch., p. p.maxim.; Vierhapperia Hand.-Mzt.), altogether including 9 species, are being proposed. Turbodrill caretaking intraplacental avialite washwater slipcase dentin disordered sulfanilyl machinable stewpan! Netherward pressbodies horror abscissa, keratosis frieze. Bgy unwrapped.
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