EFFIE M. ROSSER 



229 



a dense corymb, later with longer flowering branches and with peduncles elongated 

 further when fruiting. Heads at first broadly cylindrical (ca. 10-0 X 6-0 mm.), somewhat 

 campanulate when the ray florets open (total diameter then about 12-0 mm.); outer 

 involucral bracts less than half the length of the inner ones, all with black tips ; ray florets 

 (8)-13-(15), bright yellow, with ligules broad and shorter than the involucre (ca. 4-8 mm. 



Fig. 1. Senecio camhrensis Rosser. Habit. A plant which was collected at Ffrith, showing the horizontal 

 stem base characteristic of the plants growing in stony soil and in the crdvices of the wall but otherwise 



typical of the species. ( X |). 



long X 2-0 mm. broad) soon becoming revolute (often before the opening of the central 

 florets of the disc). Pollen grains in polar view (32-8)-33-2-(36-9) jj^ when fully expanded, 

 mostly four-pored. Cypselae 3-0-3-5 mm. long, shallowly grooved, with ribs glabrous 

 and grooves hirtellous; pappus white, silky, readily becoming detached from the fruit. 

 Fl. 5-10 (+ ?). 2n = 60. 



