HOBKIRK : NOTES ON SOME FORMS OF CRAT^GUS. 



63 



nec uUo latere applanatum. Sive igitur offerat q[nis alterutrius florem, 

 sive folium aut fructum, momento sine haBsitatione uUa speciem diagnos- 

 cemus." (i) (Jacq. Florae Austriacae, Vol. iii. p. 51. dato 1775. fig. vol. 

 iii. t. 292.) 



From the above description it would appear that the author's speci- 

 men was somewhat different to those now described under his name — as 

 he states that the peduncles are not hau^y, whereas in the more modern 

 descriptions this is given as one of the principal characters by which it is 

 separated from oxyacanthoides — thus Boreau writes, Corymbes late- 

 raux, ordinakement pubescents." (Fl. du Cent. ii. p. 231,) and Prof. 

 Babington, peduncles and calyx villose." (Man. Ed. 5. p. 117.) 



Thuillier in his Flore des Environs de Paris, (1824, p. 246-6.) makes 

 the principal differences of his oxyacanthoides to be in the leaves thus : — 

 0. oxYACANTHA. C. foliis obtusis subtrifidis serratis." 



Epine hlanche. Feuilles obtuses, dentees en scie et divisees en trois. Fleurs 

 blanches. 



OXYACANTHOIDES. C. spinosa, glaberrima foliis subrotundo-ovalibus, 

 basi acutis breviter 3 vel sub -5 lobis : lobis rotundatis." (2) 



In the Linnea" vol. iv. p. 379, are descriptions of three Crataegi 

 by Dr. C. A Fingerbrush, as follows : — 



1. — 0. Kyrtostyla. 



0. spinosa, foliis utrinque glabris vel subtus nervis ciliatis, floribus 

 corymbosis monogynis, stylo deflexo, calycibus hirsutis, laciniis oblongis 

 acuminatis patentibus apiee obtusis, fructibus oblongis basi faveolatis, 

 nucleum 1, ovato-oblongum, fusco-brunneum, dorso convexum 3-4 

 sulcatum, facie obversa rima longitudinaliter infra medium lunbilicata 

 instructa, forentibus." 



(1) But in G. monogyna the leaves are very glabrous and more shining, very deeply 

 divided into three or five acute lobes, and either entire, or serrate at the summit with 

 small teeth. Peduncles without hairs. Sepals always both in flower and fruit 

 fiiUy reflexed, with their backs closely appressed both to the germen and 

 the fruit. Style constantly one, springing from the centre of the germen : I have 

 never seen this vary in any flower. The fruit bears one seed, also constant, which 

 is sub -rotund and not flattened at the side. Whether, therefore, we consider the 

 flower, the leaves, or the fruit, I have not a moment's hesitation in separating this 

 species. 



(2) 0. oxyacantlia. Leaves obtuse, subtrifid serrate. White Thorn. 



C. oxyacantTioides. Spiny, leaves glabrous, subrotund-oval, base acute, shortly 

 three or sub-five lobed, lobes rounded. 



