1921] REIIDER, NEW SPECIES, VARIETIES AND COMBINATIONS 21 



form, we have to assume that it agrees with the type and represents a 

 form identical with a specimen from a plant cultivated at Chico under 

 the P. O. G. No. 16003 and with several specimens received from "In the 

 Woods" Chevy Chase, Md., under Nos. 520, 524, 531, 532 and 533, 

 which have pubescent leaves and white flowers. I therefore propose to 

 use the name P. mume f. alba, n. comb. (Armeniaca mume var. alba 

 Carriere in Rev. Hort. 1885, fig. 102 [p. 564], 566) for this form. For 

 the double-flowered pink form the oldest valid and available varietal 

 name seems to be P. mume f. Alphandii, n. comb. {Armeniaca mume var. 

 Alphandii Carri&re, 1. c. 564, tab.). There seem to be also forms of var. 

 tonsa with double pink flowers, as a specimen collected in the Municipal 

 Park, Zaukadoo, Shanghai, by Professor L. H. Bailey on April 1 and 

 May 20, 1917 (Herb. L. H. Bailey) shows. More and complete material, 

 however, of the various forms is needed, before we can attempt their 

 exact classification. 



Prunus kansuensis (subgen. Amygdalus), sp. nov. 



Frutex altus erectus ramis virgatis; gemmae parvae fusco-brunneae 

 perulis ovatis mucronulatis nitidulis glabris albo-ciliolatis; ramuli horno- 

 tini graciles, glabri, virides vel purpurascentes, annotini brunnei, pallide 

 punctulatis. Folia oblongo-lanceolata vel lanceolata, 7-12 cm. longa et 

 1.5-3.5 lata, infra medium latissima, longe acuminata, basi cuneata et 

 in petiolum decurrentia, adpresse serrata dentibus obtusiusculis glandu- 

 loso-mucronulatis, inferiora minora interdum grossius serrata dentibus 

 plus minusve patentibus, supra laete luteo-viridia, glabra, subtus paullo 

 pallidiora, secus costam basin versus villosa et interdum ad venas spar- 

 sissime villosa; nervis in foliis turionum utrinsecus 8-12 subtus elevatis, 

 reticulo nervulorum fere obsoleto; petioli sursum marginati, glabri, in 

 turionibus plerique 5 mm. longi, ei foliorum fasciculatorum 3-8 mm. 

 longi, apice eglandulosi, rarius glandulis imperfectis notati. Flores in 

 axillis bini, ex utraque gemma solitarii, subsessilia; calyx purpurascens; 

 sepala anguste ovalia, 4-4.5 mm. longa et 2.5-3 mm. lata, tubum late 

 campanulatum utrinque glabrum paullo superantia, intus glabra, extus 

 laxe languinoso-villosa; petala alba vel albida, ovalia, 1.2-1.4 cm. longa 

 et 7.5-9 mm. lata, apice obtusa, basi late cuneata et in unguiculum brevis- 

 simum contracta; stamina 25-30, 0.4-1 cm. longa, longiora petalis circiter 

 triente breviora; antherae late ovalia, circiter 1 mm. longae; stylus ad 

 medium vel ultra longe villosus, ovario incluso 1.4-1.7 cm. longus, petala 

 paulla superantia vel subaequantia. Drupa subglobosa, dense velutina, 

 vix edulis; putamen oblique ellipsoideum v. obovoideo-ellipsoideum, 2 

 cm. longum et 1.3-1.5 cm. latum, leviter compressum, 1.1-1.4 cm. eras- 

 sum, utrinque carinatum, apice brevissime apiculatum, basi sulcis satis 

 profundis longitudinalibus sursum curvatis et plus minusve anastomo- 

 santibus. 



