448 WILSON EXPEDITION TO CHINA 
villosus, intus sericeo-pilosus, dentes ovato-triangulares, acuti, extus 
villosi, intus apicem versus ferrugineo-villosi ceterum glabri; petala 
rotundata, apice leviter emarginata, 2 mm. longa et 2.5 mm. lata, in 
sicco flavescentia; stamina 20, petala fere aequantia; discus pallidus, 
10-lobatus lobis distinctis leviter emarginatis; carpidia pilosa stylis 
apicalibus stamina dimidia aequantibus. Fructus sepalis erecto- 
patentibus; folliculi sepala vix superantes, 2 mm. longi, pallide fla- 
vo-brunnei, nitentia, fere glabra, intus apice gibbosi, extus stylum 
subapicalem patentem v. patenti-erectum gerentes; semina fusifor- 
mia, 1.2 mm. longa et 0.3 mm. diam., utrinque acuta, pallida brun- 
nea, minutissime reticulata. 
Western Szech'uan: west and near Wén-ch'uan Hsien, dry 
places, alt. 1000-1300 m., June and November 1908 (No. 13185, type); 
near Mao-chou, arid places, roadsides, alt. 1000-1600 m., May 24, 
1908 (No. 2766); Szu-ma-chi, A. von Rosthorn (No. 2555). 
This species is most closely related to S. Henryi Hemsley, which is easily dis- 
tinguished by its larger and broader leaves, usually abruptly narrowed at the 
base, larger flowers and larger and looser inflorescence. Spiraea canescens G. Don 
and its variety sulphurea Batalin, with which it had been confused, probably on 
account of the similarity in size and shape of the leaves, is well distinguished by 
the angular branches and by the pointed winter-buds covered by only two outer 
scales. 
Spiraea aemulans Rehder, n. sp. 
Frutex 2-metralis ramis virgatis; ramuli teretes, hornotini dense 
fulvescenti-villosi, annotini apicem versus villosi basim versus glab- 
rescentes, brunnei, vetustiores glabri, griseo-brunnei; gemmae ovoideae, 
obtusiusculae, circiter 1 mm. longae, obscure brunneae, pubescentes, 
perulis imbricatis pluribus obtectae. Folia decidua, elliptica v. elliptico- 
oblonga, basi cuneata, apice pauciserrata v. integra, acuta v. obtusius- 
cula, 1-2.5 cm. longa et 0.6-1 cm. lata, supra luteo-viridia, villosa, 
subtus sericeo-villosa, densius ad venas, nervis utrinsecus 3-4; petioli 
1-2.5 mm. longi, villosi. Inflorescentia corymbosa, multiflora, densa, 
convexa, dense villosa, 1.5-2.5 em. diam., in apice ramulorum pluri- 
foliatorum, 0.5-1.5 em. longorum; flores 4-5 mm. diam., albi; calycis 
tubus aperte turbinatus, extus villosus, intus pilosus, pare triangulari- 
ovati, acuti, extus villosi, intus glabri, apicem versus tantum villosuli; 
petala rotundata, 1.5 mm. longa et 2 mm. lata; stamina 20, petalis 
subaequilonga; discus conspicuus, pallidus, plerumque 10-lobatus lobis 
distinctis leviter emarginatis; carpidia pilosa, stylis apicalibus viX 
1 mm. longis. Fructus maturus desideratur. 
