PHANEROGAMS — PROFESSOR BAYLEY BALFOUR. 147 



herbacpa 8 linearia obtusa rarius erosa, calyculi squamis brevibus paucis ovatis herbaceis 

 in bracteolas transeuntibus. Corollce ligula 4-dentata. Antherce basi breviter sagittatae. 

 Styli lobi elongati setulis nigris suffulti. Aclienia linearia subfusiformia non rostrata 4- 

 angulata facie quoque plerumque bicostato, costis angulisque rugosis. Pap-pus multiseri- 

 atus, exterior lanato-intricatus basi in atmulum deciduum cum setis intimis paucioribus 

 serrulatis cohserentibus. 



Socotra. Not uncommon on the hills. B.C.S. n. 307. Schweinf. n. 570. 



Distrib. Endemic. 



It is notably extremely difficult to define the limits of genera amongst 

 ligulifloral composites, and it is not without some suspicion that we refer our 

 plant to this genus. In this determination I have been influenced mainly by 

 the character of the pappus. Its dimorphism is very distinctive of the genus. 

 But in the achenes our plant does not quite agree with the generic character. 

 The many ribs and the somewhat spindle form brings it much nearer the 

 species included in Crepis, under the section Youngia, from which section, 

 indeed, its pappus is the only point excluding it. Where the relations of genera, 

 as we accept them defined by Hooker and Bentham, are so intimate, and one 

 species possesses, as in this instance, to some extent the characters of two 

 genera, it practically comes to be merely a matter of convenience which genus 

 receives preference. 



In Launcea the Socotran plant has its affinity with L. bellidifolia, Cass, (in 

 Diet. Sc. Nat. xxv. (1822), 321 ; Oliv. and Hiern in Oliv. Flor. Trop. Afr. iii. 

 460), a flagelliform species of considerable distribution in Africa, Mascarene 

 Islands, and India. Its habit with many other characters readily distinguishes it. 



Order XXXVII. CAMPANULACE^E. 



A large family, spread over the whole globe. Two genera are Socotran, one 

 of which is essentially a northern hemisphere genus, and the other has its 

 headquarters in the southern hemisphere. 



1. WAHLENBEKGIA. 



Wahlenbergia, Schrad. Cat. Hort. Got. 1814, ex A. DC. Monog. Campan. 129 ; Bentb. et Hook. 

 Gen. PI. ii. 555. 



A large genus, chiefly of the southern hemisphere, the majority of species 

 occurring in south Africa ; a few are general old world plants and denizens of 

 the Mediterranean region, and one is widely dispersed in western Europe. 



W. riparia, Alph. DC. Monog. Campan. 146, and Prod. vii. 435 ; Hemsl. 

 in Oliv. Flor. Trop. Afr. iii. 480. 



Socotra. On the hills about Galonsir. B.C.S. n. 189. 



