FIGURE 5 in Foliar architecture of some members of the tribe Senecioneae (Asteraceae) with a key for identification of the Mexican genera

FIGURE 5. Veinlet endings and dentate margin in Senecioneae leaves. A. Unbranched veinlet ending in unmodified tracheids, Robinsonecio gerberifolius. B. Non-ramified veinlet ending in dilated tracheids, Pentacalia parasitica. C. Once-branched veinlet ending in dilated tracheids, Pseudogynoxys haenkei. D. Conspicuous secretory canals (arrows), Pseudogynoxys chenopodioides. E. Once-branched veinlet ending in vermiform tracheids, secretory canals evident (arrows), Werneria nubigena. F–H. Teeth with tertiary venation, F, Barkleyanthus salicifolius; G, Erechtites valerianifolia; H, Telanthophora liebmanii. I–O. Teeth with quaternary venation, I, Nelsonianthus tapianus; J, Pippenalia delphinifolia; K, Psacalium purpusii; L, Pseudogynoxys haenkei; M, Senecio mulgediifolius; N, Telanthophora grandifolia; O, Villasenoria orcuttii. P–R. Teeth with fifth-order venation, P, Digitacalia jatrophoides; Q, Packera sanguisorbae; R, Roldana angulifolia. Bar is 100 μm in A–D; 500 μm in E, F, L, P, R; 1 mm in G–K, M, O, Q.