UMBELLIFEBM. 



103 



hpiiim, from the Cape, has the same hollow with an indistinct intra- 

 marginal circle. Opopanax orientalis has been rightly united to 

 Malahaila ; but, by the intermediation of 0. persicum, it is inseparable 

 from 0. chirojuum, differing only by its numerous vittse, and from 

 Stenotcema, which has also two or three vittae in each furrow, and is 

 otherwise very near Pastinaca and Heracleum} 



Johrenia is scarcely more distinct from the Peitcedans. The fruit 

 is not so thin, and the sube- 

 rose margm itself is thicker ; 

 its general form is more ellip- 

 tical, and the surface of the 

 ovary nearly glabrous, whilst 

 Ducrosia has a more orbicular 

 fruit, and the surface of the 

 ovary is hairy. The primary 

 ridges are suberose, tolerably 

 thick, but on the whole not 

 prominent. They are peren- 

 nial herbs of western and 

 temperate Asia. They also 

 connect the Peueedans with 



TordyUum (fig. 95, 96), which has visible sepals, rayed petals, and a 

 fruit often orbicular, coin-like, very compressed, with margin much 

 thickened, whitish, nearly always rugose, more prominent than the 

 primary ridges, which are scarcely visible. In T. Auchcri, of which 

 the genus Ormosciadiuni has been made, the rugosity is more marked, 

 and linear traces of the dorsal secondary nervures are perceptible. 

 There are species in which the vittse are solitary in each furrow, and 

 others in which they are multiple. The latter is the case in Polytcenia, 

 which has a fruit with very thick margin and often longer relatively 

 to its size ; it is from North America. In Gondijlocarpiis, the vittse 

 are also numerous, very close, and the central coat of the fruit is 

 very thin. * In Hasselquistia and AinswortJiia, there are fruits near 



Fi-. 95. Fruit (?). 



* The genus Symphyoloma is distinguished scnce of vitta} and of carpophors ; so that 



from Jleraclemn, of which it has otherwise the the mericarps (one of which is generally sterile) 



fruit with marginal wings a little thicker, hy remain united to each other to the end. The 



two somewhat remarkable characters : the ah- plant is a perennial of the Caucasus. 



