Tas. 8798. 
MALUS RIvuLARIs. 
Western North America. 
Rosaceak. Tribe PomEar, 
Matus, Mill.; Benth, et Hook, f. Gén. Plant. vol. i. p. 626 (Pyrus). 
Malus rivularis, Roemer in Fam. Syn. vol. iii. p. 215; Sarg. in Trees of 
N. Amer. p. 355, fig. 279; Howell in Flora of N.W. Amer. vol. i. p. 164; 
C. K. Schneider in Handb, Laubhoilzk. vol. i. p. 724; species M. Toringo, 
Sieb. et M. Sargentii, Rehder, magnopere accedens, cum ambabus calyce 
maturo deciduo congruens, ab ambabus calyce juvenili dentibus tubo 
brevioribus fructibusque ellipsoideis diversa, 
_ Arbor 5-9 vel nonnunquam 12-metralis, caule 3-4°5 dm. crasso; novelli 
primum cinereo-pubescentes, demum glabri, annotini purpureo-brunne- 
scentes. Jfolia decidua, ovata vel ovato-lanceolata, acuta vel acuminata, 
basi saepius rotundata raro cuneata, supra medium nonnunquam obscure 
lobata, margine minute acute serrata, 3° 7-8-7 cm. long, 2-3°7 cm. lata; supra 
saturate viridia primum puberula demum glabra, subtus pallidiora persisten- 
ter pubescentia ; petiolus 1*2-3°7 cm. longus, pubescens. Flores 2-2°5 cm. 
lata, terminales vel in axillis foliorum superiorum, in corymbos 8-12-floros 
5-7°5 cm. latos aggregati, aestate ineunti aperti. Calyx 5-lobus; tubus 
obeonicus, pubescens ; lobi lanceolati, 5 mm. longi, extra parce pubescentes 
vel glabri, intus dense pallide cinereo-floccosi. Petala 5, orbicularia, 
breve unguiculata et prope basin parce irregulariter dentata, alba vel badia, 
1-5 cm. longa. Stamina 16-20; filamenta explanata glabra. Styli 2-5, 
saepissime 3, prope basin counati, glabri. Fructus ovoideo-oblongus, 
pendulus, 1°2-2 em. longus, 1 cm. latus, glaber, auctumno fere peracto 
maturescens, tune luteus et a latere solem spectante puniceo-suffusus, vel 
in locis umbrosis viridescens, apice calyce delapso fovea distincta notatus ; 
pedunculus fructiger gracilis, 2°5-3°7 cm. longus, glabrescens. Semina 
saepius 38, 1 em. longa, apiculata, compressa, pallide brunnea.—Pyrus 
rivularis, Dougl. apud Hook. Fl. Bor.-Amer. vol. i. p. 203, t. 68; Sarg. 
in Silva of N. Amer. vol. iv. p. 77, t. 170; Elwes & Henry in Trees of 
Gt. Brit. and Ireland, vol. vi. p. 1569; Jepson in Trees of Calif. p. 189; 
Bean in Trees and Shrubs, vol. ii. p. 292. P. fusca, Rafin. in Med. Fl. 
vol. ii. p. 254; C. K. Schneider, loc. cit. sup. P. diversifolia, Bong. in 
Mém. Acad. Sci. St. Pétersb. ser. 6. ii, p. 133. Malus diversifolia, Roem. 
loc. cit. supra.—W. J. BEAN. 
Of the genus Pyrus as conceived by Linnaeus and 
adopted by Bentham and Hooker, the section Malus, or 
the crabs, is poorly represented on the continent of 
North America, some four or five species only being 
found there ; the pears (Pyrophorum) are not represented 
at all. Malus rivularis is the only crab found west of 
Aprit—J tye, 1919, oe 
