174 JOURNAL OF THE ARNOLD ARBORETUM [vol vi 



Sect. III. RHODORASTRUM Maxim. 

 Represented by 10. R. dauricum var. mucronulatum 



1G. Rhododendron dauricum var. mucronulatum Maximowicz in 



Mem. Acad. Sci. St. Petersb. ser. 7, xvi. no. 9, 44 (Rhod. As. Or.) 



(1S70). — Wilson in Jour. Arnold Arb. iv. 50 (1923) where references to 



the synonymy and literature and a full account of this plant are given. 



A synonym not cited in my account of this variety is: 



Rhododendron Argyi Leveille in Fedde, Rep. Spec. Nov. xn. 102 (1913); 

 in Mem. Acad. Cien. Art. Barcelona, no. 22, 10 (Cat. PL Kiangsou) (1916), 



In the summer of 1920, I saw LeveilUVs type preserved in Herb. 

 Edinburgh and identified it as Ii. dauricum var. mucronulatum Maxim. 

 In March of this year at my request Professor W. Wright Smith 

 examined the specimen and is in complete agreement with my identifica- 

 tion. As far as I can make out the place where this plant was collected 

 is between Nanking and Soochow and I strongly suspect that it came 

 from a garden. If it was a spontaneous plant this would be several 

 hundreds of miles south of the known habitat of Maximowicz's plant. 



Subgen. II. AZALEASTRUM Planch. 



Sect. I. EUAZALEASTRUM Wils. 



KEY TO THE SPECIES 



Corolla rotate 



Stamens 5 17. R. ovatum 



Stamens 10 18. R. ellipticum 



17. Rhododendron ovatum Planchon in Rev. Hort. 1854, 43. — Wilson 



in Jour. Arnold Arb. v. 103 (1924), where references and synonymy and 



a full account of the species are given. A synonym of this species not 



recorded in my account is: 



Rhododendron lamprophyllum Hayata, Icon. PL Formos. in. 135 (1913). — 

 Kanehira, Formos. Trees, 319, % 8, 321 (1917). 



Hayata based his species on specimens collected by Messrs. T. Kawa- 

 kami and U. Mori on Mt. Randai in August, 1908. He describes the 



capsule as "ovoideo-ellipsoidea, 8 mm. longa, o l / 2 mm. lata. " This is 

 slightly larger than any fruit I have seen of 11. ovatum Planch, from conti- 

 nental Asia. Thanks to the courtesy of R. Kanehira I have a fragment 

 of Ilayata's type specimen and I can see nothing to distinguish it from 

 the well-marked and widely distributed R. ovatum Planch. 



18. Rhododendron ellipticum Maximowicz in Bull. Acad. Sci. St. 



Petersb. ser. 3, xxxii. 497 (Mel. Biol. xn. 742) (1888).— Ilemsley in 

 Jour. Linn. Soc. xxvi. 22 (1889).— Millais, Rhodod. 158 (1917). 



A glabrous bush. Leaves coriaceous, elliptic, 6-9 cm. long, 2.2-4.5 

 cm. broad, short-apiculate, petiole 1.3-2 cm. long, glabrous. Flowers 1-2 

 in fascicles at the end of the shoot; pedicels glabrous, 2.5-3 cm. long, 

 sheathed in imbricated lanceolate bud-scales; calyx nearly obsolete or 

 with depressed hemispherical lobes; corolla pale rose-color, rotate, G cm. 



