1925] PALMER, SYNOPSIS OF NORTH AMERICAN CRATAEGI 77 



Crataegus 



yadkinensis Ashe in Jour. Elisha Mitchell Sci. Soc. xvii. 17 (1900). — 



Flavae. — North Carolina (type locality: along Yadkin River, Roan 

 County). (?) 



Youngii Sargent in Jour. Arnold Arb. iv. 105 (1923). — Microcarpae.— 



North Carolina, South Carolina (type locality: Greensboro, N. Car.). 



NAMES EXCLUDED FROM THE GENUS 



Crataegus 



Amelanchier Desfontaines, Hist. Arb. II. 149 (1809) = Amelanchier 



canadensis Medic. 



amoena Salisbury, Prodr. 357 (1796) = Amelanchier canadensis Medic. 



arbutifolia Aiton, Hort. Kew. ed. 2, in. 202 (1811) = Heteromeles 

 arbutifolia Roem. 



coronaria (L.) Salisbury, Prodr. 357 (1796) = Malus coronaria Mill. 



densiflora Desfontaines apud K. Koch, Dendr. I. 186 (1869), as a syn- 

 onym = Heteromeles arbutifolia Roem. 



racemosa Lamarck, Encycl. I. 84 (1783) = Amelanchier canadensis 



Medic. 



spicata Lamarck, Encyl. i. 84 (1873) = Amelanchier spicata K. Koch 



(in part). 



SYNOPSIS OF THE GROUPS 



Nutlets not pitted or deeply concave on ventral surfaces. 



Leaves merely serrate or dentate or rarely slightly lobed on shoots. 



Veins of leaves not deeply impressed; fruit hard and inedible, dotted or 



blotched but rarely punctate I. Crus-galli. 



Veins of leaves deeply impressed; fruit becoming soft and edible. 



II. Punctatae. 



Leaves of flowering branches or some of them variously lobed or divided. 

 Fruit usually more than 10 mm. diameter (8-20 or rarely more or less); 

 nutlets variously ridged or rounded on back. 



Leaves of flowering branches usually conspicuously narrowed at base or 

 attenuate into winged petioles. 

 Corymbs few-flowered (1-5 flowers or rarely a few more). 



Calyx lobes small, not conspicuously serrate; fruit usually becoming 

 soft and edible XVIII. Aestivales. 



Calyx lobes large and foliaceous, conspicuously serrate; fruit usually 

 hard and inedible (except in C austromontana). 

 Corymbs 1-3-flowered; leaves relatively small, mostly spatulate or 



obovate XVII. Uniflorae. 



Corymbs 3-5-flowered (or rarely a few more); leaves larger; corymbs 

 villous or glandular but not conspicuously bracteate. 



XVI. Triflorae. 



Corymbs 5-10-flowered (or rarely a few more); inflorescence con- 

 spicuously glandular and bracteate XV. Bracteatae. 



Corymbs many-flowered (5-20 flowers or more). 



Inflorescence and petioles generally conspicuously glandular; leaves 

 subcoriaceous. 

 Leaves relatively large, usually of ovate or oval type; branchlets 



not conspicuously zig-zag V. Intricatae. 



Leaves relatively small, usually of obovate or elliptic type; branch- 

 lets often conspicuously zig-zag XIV. Flavae. 



