1920] REIIDER, NEW SPECIES, VARIETIES AND COMBINATIONS «63 



germanica the name C. Gillotiiy while C. Dardari is restricted to the graft 

 hybrids between the same species. 



Crataegus monogyna f . biflora, comb. nov. — C. Oxyacantlia 1. hiflora 

 Weston, Bot. Univ. i. 79 (1770). — Mespilns Oxyacantlia praecox Dumont 

 de Courset, Bot. Cult. ed. 2, v. 453 (1811). — Crataegus Oxyacantha 25, 

 praecox Hort. apud Loudon, Arb. Brit. ii. 833 (1838). — C monogyna 

 var. praecox Henry in Elwes & Henry, Trees Gr. Brit. Ircl. \^i. 1736 (1913), 

 non Dippel (1892). 



Though Weston*s description of this form may be considered insufficient, 

 for his designation of the form as " biflora " can mean either two-flowered 

 or twice flowering, the citation of the vernacular name " Glastonbury 

 Tliorn " should be sufficient for identification. Moreover, the name 

 " praecox ** under Crataegus monogyna is preoccupied by (7. monogyna var. 

 praecox Dippel (1892) which is not based on any previously published name 

 and according to the description is entirely different from the Glaston- 

 bury Thorn and apparently not a form of C. monogyna. 



Crataegus pentagyna Waldst. & Kit. var. Oliveriana, comb. nov. — 



Mespilus Oliveriana Dumont de Courset, Bot. Cult., ed. 2, v. 454 (1811). — 

 Crataegus Oliviriana {sic) Bosc in Nouv. Cours Agric. ed. 2, ii. 222 

 (1821). -^ C. Oliveriana Bean, Trees k Shrubs Brit. Isl. i. 431 (1914). — C, 

 Oxyacantha var. Oliveriana Lindley in Bot, Reg. xxiii. t. 1933 (1837), 

 Loudon, Arb. Brit. ii. 831, fig, 606 (1838). 



This is apparently only a variety of the variable C. pentagyna Waldstein 

 & KItaibcl and differs from it chiefly in the more pubescent and more 

 finely toothed leaves, in the entire or less toothed stipules and in the 

 smaller fruit. In the first description by Dumont de Courset the leaves are 

 described as somewhat pubescent with the lobes having nearly constantly 

 three teeth at the apex. Bosc himself in 1821 describes the leaves as very 

 pubescent with 5 acute lobes on each side. Though Poiret states that he 

 received his specimens from Bosc himself, his Mespilus Oliveriana (Encyl. 

 Meth. IV. 72 [1816]) must be an entirely different plant, for he describes It 

 as "glaberrima, lobis obtusis subintegris "; De Candollc (Prodr. ii. 630 

 [1825]) follows Poiret 's description. Koch (Dendr. i. 156 [1869]) considers it 

 a form of 3/. melanocarpa M, Bicb., while Dippel, Koehne and Schneider 

 consider it a synonym of C pentagyna. 



Sorbus Harrowiana, comb. nov. — Pyrus (Sorbus) II arrowianus Balfour 

 f. & W. W. Smith in Not. Bot. Card. Edinb. x. 61 (1917). 



China. Yunnan. 



This species is remarkable for its very large leaves; the larger leaflets 

 of the 5-7-foliolate leaves are often more than 20 cm. long. 



Sorbus hybrida L. f . fastigiata, comb. nov. — Pyrus pinnatijida fasti- 

 giata Bean in Card. Chron. ser. 3, xli. 184, fig. 82 (1907). 



A form with strictly upright branches forming a fastiglate tree. 



{To be continued) 



