BETULACEAE. — CORYLUS 449 



Subsect. 1. COLURNAE Schneider, n. subsect. (descriptio in clavi). 

 The Tree Hazels form, I beUeve, a natural group on account of their habit of 

 growth and the characters of the bark of the branchlets. They may be divided 

 into two groups by the color of the anthers. It is a rather strange fact 

 that the anthers of C. Colurna Linnaeus are without any hairs, which are always 

 present in all the other species of the genus of which I have seen the male flowers. 



3. Corylus Colurna Linnaeus, Spec. 999 (1703), exclud. synon. pro parte. — 

 Watson, Dendrol. Brit. IL 99, t. 99 (1825). — Hartig, Vollst. Nalurg. Forstl. 

 Culturpfl. 22S, t. 17 (18-1(>-51), exclud. var. b. — Spach in Ann. Sci. Nat. ser. 2, 

 XVI. 101 (1841). — Reichenbach, Icon. Fl. Germ. XIL 6, t. 638 (1850). — A. De 

 Candolle, Prodr. XVI. pt. 2, 131 (1864), exclud. var. /3 et y. — Hempcl & Wilhehn, 

 Baume & Slrdticher, II. 29, fig. 135 (1894). — Schneider, Dendrol. Winterst. 171, fig. 

 164 o-r (1903); III. Handb. Lauhholzk. I. 144, fig. 82 a-f, h, 83 a, 84 o-r (1904).— 

 Winkler in Engler, Pflmizenr. IV.-61, 50, fig. 14 G (1904), exclud. var. /Set y.— 

 Elwes & Henry, Trees Gr. Brit. & Irel. III. 521 (1008) exclud. var. 2 and 3. — 

 Ascherson & Graebner,Si/n. Mitteleur. Fl. IV. 383 (1910), exclud. plantis Ilimalaica 

 et Chinensi. — Hickel in Bidl. Soc. Dendr. France, 1912, 107, fig. e-e'" (1912). 



EUROPE : from Bosnia and southern Hungary southward through southeastern 

 Europe. 



WESTERN ASIA. Asia Minor to Transcaspia. 



This species is often reported from the northwestern Himalaya, but the Tree 

 Hazel of this region is C. Jacquemontii. I mention C. Colurna here to indicate the 

 differences between it and the Himalayan and Chinese species hitherto usually 

 considered varieties of the European and west Asiatic species. See my remarks 

 under the section and in the key. The filaments of the anthers are united mostly 

 at the base and are very short, the thecae being elliptic-oblong; the bracts are dis- 

 tinctly acuminate at the apex, covered with a dense fine pubescence and more or less 

 glandular. 



4. Corylus Jacquemontii Decaisne in Jacquemont, Voyage, IV. Bot., 160, t. 160 

 (1844).— Bean in Kew Bull. Misc. Inform. 1913, 163, t. (1913); Trees & Shrubs 

 Brit. Isl. 1. 452 (1914). 



Corylus lacera Wallich, Cat. No. 2798 (nomen nudum) (1829). 



Corylus Colurna, var. lacera A. De Candolle, Prodr. XVI. pt. 2, 131 (1864). — 



Stewart, Punjab PI. 201 (1809). — Henry in Elwes & Henry, Trees Gr. Bnt. 



& Irel. III. 521 (1908). 

 Corylus Colurna, var. Jacquemontii A. De Candolle, Prodr. XVI. pt. 2, 131 



(18G4). 

 Corylus Colurna Brandig, For. Fl. Brit. Ind. 494 (pro parte, non Linnaeus) 



(1874); Ind. Trees, 624 (pro parte) (1906).— Hooker f., Fl. Brit. Ind. V. 



625 (pro parte) (1888). — Collett, Fl. Siml. 476 (pro parte) (1902). — Gamble, 



Man. Ind. Timb. 684 (pro parte) (1902). 



INDIA. Northwestern Himalaya: "reg. temp., alt. 7000 ped.," T. Thomson 

 (flowers and young fruits); "a Vernaguead jugum Banhatte," alt.2952m.,July, F. 

 Jacquemont (type, ex Decaisne); Kumaon, Dwali, alt. 2600 m., Strachcij cO Winter- 

 bottom (leafy branchlets with flowers); without preci.'ic locality, R. BHnckworth 

 (Wallich Cat. No. 2798, type of C. lacera). United Provinces: Dchra Dun, 

 Chakrata, alt. 2300 m., May 11, 1912, Sulakhan Sing (with young fruits). 



According to the characters given in the key, this species is distinct from both 

 the foregoing and the following species. The thecae of the anthers seem to be more 

 round-elliptical. The length of the petioles and the pubescence of the leaves seem 



