1920] REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 199 



Reg. pi. 2003 is either a very large-flowered form of P. puhescens or a hybrid 

 between that species and P. grandiflorus, while P. grandiflorus Watson, 

 Dendr. pi. 46 is apparently typical P. puhescens Lois. Both figures show 

 racemose flowers and have not the slightest resemblance to P. floridus. 



Faxonii 



Frutex ramis gracilibus divaricatis: folia anguste elliptica vel elliptico- 

 oblonga, acuminata, basi cuneata, 3.5-5 cm. longa, remote minuteque 

 denticulata, plus minusve curvata et pendentia, supra glabra, subtus satis 



surcu 



8 cm. longa; pedicelli 3-5 mm. longi, ut calyx dense strlgoso-villosi; styli 



stamina paulo superantes, apice ad quartem partem divisi, stigmatibus latis. 



Plant in Hort. Chandler, Jamaica Plain, Mass., of unknown origin (type 



specimen collected June 28, 1907, by C. E. Faxon, preserved in the Arnold 

 Arboretum herb.). — Also growing in the Arnold Arboretum from cuttings 



taken from the type plant. 



This peculiar form suggests in its habit and in the shape and size of its 

 leaves P. laxus, while in the pubescence of tlie cal^-x and of the under side 

 of the leaves it agrees with P. floridus, though the hairs are more strigose 

 than villous. It is hardly possible that it is a hybrid between^ these two 

 species, as the plant was growing here before P. floridus was introduced 

 into cultivation. It is more likely that the plant was brought from the 

 South and represents a form of P. floridus approaching P. laxus. 



HYBRIDS AND GARDEN FORMS 



X Philadelphus verrucosus Schrader var. nivalis, comb, no v. — P. nivalis 



Jacques in Ilortic. Unlversel, ii. 19 (1841). 



This variety differs from the type chiefly in its exfoliating chestnut-brown 

 bark; the leaves are generally smaller and less coarsely dentate. Jacques 

 states that it was raised from seed of P. latifolius Schrad. ( = P. pubes- 

 cens Lois.), and he also says that seeds of P. latifolius and of P..grandi- 



verrucosus 



florus rarely reproduce the typical parent form. 



aus, comb. nov. — P. nivalis spedabilis 

 pi 671 us Hort. — P. coronarius? nivalis plenus Schelle in Beissner, Schelle & 

 Zabel, Handb. 128 (1903.) — P. coronarius nivalis spectabilis plenum hort. 

 Spaeth ex Schelle, 1. c, pro s^-non. — P. puhescens fl. plena hort. ex Schelle, 



1. c, pro synon. 



A form with double flowers. 



X Philadelphus monstrosus Schelle in Bejssner, Schelle & Zabel, Handb. 



P. Gor- 



129 (1903), nom. seminud.'— (? P 



donianus monstrosus Hort. {Gord. X latifolius) Spaeth, Cat. No. 100, 95 



(1897), nomen. 



Tall shrub; bark of the previous year's branchlets grayish or light yel- 

 lowish brown, close, with cross-cracks; young branchlets nearly glabrous: 

 leaves ovate to ovate-oblong, usually rounded at the base, acuminate, 

 3-8 cm. long, remotely denticulate, very sparingly pubescent above. 



