222 WILSON EXPEDITION TO CHINA 



" disque peu 4pais," and his figure shows a disk like that of Rhamnus, but in our 

 specimen I find the disk well developed and not very different from that of Ber- 

 chemia. 



Chaydaia is certainly closely related both to Berchemia and to Rhamnella. 

 They may be distinguished as follows : 



Folia integerrima, nervi utrinsecus 6-15, paralleli, a costa ad marginem dis- 



tincte percurrentes et in margine ipso evanescentes; inflorescentia racemoso- 



V. paniculato-cymosa. 



Petioli in comparatione laminae satis longi; folia symmetrica; sepala tantum 



apice intus incrassata; petala oblonga v. lanceolata, apice Integra; fructus 



bilocularis. Berchemia. 



Petioli satis breves, folia paullo asymmetrica; sepala intus apice incrassata et 



etiam medio rostellata; petala obovalia, apice saepe undulata v. lobulata; 



fructus unilocularis. Chaydaia. 



Folia fere semper distincte anguste serrulata, nervi utrinsecus 5-10, paralleli 



V. subparalleli, a costa versus marginem currentes sed paullo ante marginem 



inflectentes diluentes; petioli satis breves v. brevissimi; inflorescentia fasci- 



culato-cymosa, axillaris; sepala ut in Chaydaia; petala obovalia, basi breviter 



unguiculata, apice integra v. distincte emarginata; fructus uni- v. bilocularis. 



Rhamnella. 



RHAMNELLA Miq. 



Microrhammis Maximowicz, non A. Gray. 

 This genus, which has hitherto been considered monotypic, shows a rather rich 

 development in central China. A short description of the genus with regard to 

 the allied genera is given above. The sepals of all the new species and also of 

 R. franguloides Weberbauer are distinctly beaked in the middle, as in Chaydaia. 

 The ovaries seem to be always distinctly bUocular, but the fruits are often, but 

 not always, unilocular. 



Rhamnella Wilsonii Schneider, n. sp. 



Frutex 2-6 m. altus; ramuli hornotmi tenuissimi, viridescentes, 

 glabri v. ex parte minutissime pilosi, vetustiores brmmescentes; 

 gemmae parvae, obtusae; stipulae colore ramulorum, parte decidua 

 4 mm. longa subulata. Folia papyracea, pro genere perparva, ovata 

 V. anguste ovata, basi rotunda v. obtusa, apice acuta v. breviter 

 acuminata, margine infra medium plerumque integra, versus apicem 

 indistincte crenato-serrulata, dentibus satis distantibus, ea ramulorum 

 floriferorum 1-3.5 cm. longa et 0.6-1.6 cm. lata, a basi ramu- 

 lorum ad apicem accrescentia, ea ramulorum fructiferorum ad 4.2 

 cm. longa et 2.8 cm. lata, supra obscure viridia, glabra, subtus paullo 

 pallidiora, glabra v. ad costam paucissime pilosa, nervis utrinque 

 plerumque 5; petioh 2-4 mm. longi, parce pilosi. Ijiflorescentia 

 axillaris, pseudo-umbellata, sessilis v. pedunculo nudo brevissimo 

 suffulta, 2-3-flora, glabra; flores viridi-flavescentes, glabri, normales, 

 sepalis quam stamina petalaque longioribus ovatis acutis. Fructus 



