334 JUGLANDACEAE 



ft Leaflets 3-5: nuts rounded or notched at the base. 



Twigs and lower surface of the leaflets puberulent. 9. H. ovata. 



Twigs and lower surface of the leaflets glabrous or 



glaucous. 10. //. Carolinae-septentrionalis. 



** Middle lobe of the staminate calyx about equal to the lateral, 

 except in No. 12 : husk of the fruit not freely splitting to 



Bark shaggy : fruit mostly subglobose : nut thin-shelled : seed 



sweet. 11. H. microcarpa. 



Bark close : fruit mostly obovoid : nut thick-shelled : seed 



bitter. 

 Foliage glabrous : staminate calyx with an elongated acute 



middle lobe : anther-sacs acute. 12. II. glabra. 



Foliage pubescent : staminate calyx with a short blunt 

 middle lobe : anther-sacs obtuse. 13. H. vittosa. 



1. Hicoria myristicaefdrmis ( Michx. f. ) Britton. A forest tree 20-35 m. tall, with 

 a trunk rarely 1 m. in diameter. Bark scaly : bud-scales scurfy or tomentose : leaves 1-3 

 dm. long ; leaflets 5-9, the blades oblong or ovate-lanceolate to obovate, 5-12 cm. long, 

 acute or acuminate, rather coarsely serrate : staminate aments 6-10 cm. long, pubescent 

 with brown scurfy hairs : fruit elliptic or elliptic-obovoid, 2.5-3.5 cm. long, prominently 

 4-ridged to the base, scurfy-pubescent : husk splitting to the base : nut apiculate at both 

 ends, exceedingly hard, furrowed. 



In low grounds or on hillsides, South Carolina and Arkansas to Alabama, Texas and Mexico. 



2. Hicoria Pecan (Marsh.) Britton. A slender tree, reaching a height of about 50 

 m., with a maximum trunk diameter of about 2 m. Bark somewhat roughened : foliage 

 pubescent when young, nearly glabrous in age : bud-scales few, valvate : leaves 1.5-3 dm. 

 long ; leaflets falcate, 11-15, the blades oblong-lanceolate, 8-15 cm. long, acuminate, short- 

 stalked: staminate aments 12-15 cm. long, sessile or nearly so near the ends of the twigs of 

 the preceding season, or rarely on the twigs of the present season : fruit oblong, 3.5-5 cm. 

 long, with a thin, 4-valved husk : nut oblong-cylindric, terete or nearly so, acute, tliin- 

 shelled, 2-celled at the base, the partitions very astringent, the seed very sweet. 



In moist soil and along streams, Iowa to Kentucky and Texas. Also introduced into the eastern 

 Gulf States. PECAN. 



3. Hicoria Texana LeConte. A small often bushy tree with a broad or rounded 

 head, sometimes 26 m. tall. Bark rough : leaves 2-4 dm. long ; leaflets 9-13, the blades 

 firm, lanceolate to oblong-lanceolate, 8-15 cm. long, somewhat acuminate, falcate, shal- 

 lowly serrate, dark green above, paler beneath, sessile or nearly so : staminate aments slen- 

 der, 5-11 cm. long : fruit oblong : nut much flattened, oblong or ovoid-oblong, smooth, the 

 seed very bitter. 



In low grounds or river swamps, Texas. 



4. Hicoria aquatica (Michx. f. ) Britton. A slender tree, sometimes 30 m. tall, with 

 a maximum trunk diameter of about 1 m. Bark flaky : foliage pubescent, or glabrate in 

 age: bud-scales valvate : leaves very numerous ; leaflets 9-13, the blades lanceolate, or the 

 terminal one oblong, 5-15 cm. long, long-acuminate, more or less lustrous, all but the ter- 

 minal one falcate : staminate aments in 3's, arising from the shoots of the season or rarely 

 on the twigs of the previous year, peduncled : fruit subglobose, but beaked, 2.5-3 cm. 

 thick, with a thin rigid, tardily 4-valved husk : nut 4-angled, slightly flattened, pointed, 

 corrugated, thin-shelled, the seed very bitter. 



In river swamps and wet woods, Virginia to Illinois, Florida and Texas. WATER HICKORY. 



5. Hicoria minima (Marsh.) Britton. A slender tree, reaching a height of 30 m., 

 with a maximum trunk diameter of about 1 m. Bark close, with shallow furrows and 

 flat ridges : foliage minutely pubescent or glabrate in age : bud-scales few, valvate : leaves 

 1.5-3 dm. long; leaflets 5-9, the blades lanceolate or oblong-lanceolate, acuminate, 8-15 

 cm. long, sessile, all but the terminal one falcate : staminate aments in 3' s, arising from the 

 bases of the shoots of the season, or rarely on the twigs of the previous year, peduncled : 

 fruit subglobose, 2.5-3 cm. thick, slightly 6-ridged, with a thin, tardily 4-valved husk : 

 nut slightly flattened, often larger than that of H. aquatica, short-pointed, thin-shelled, 

 smooth, the seed intensely bitter. [Garya amara Nutt. J 



In swamps and low woods, Quebec to Minnesota, Florida and Texas. 



6. Hicoria pallida Ashe. A forest tree, with a very rough pale bark and purple- 

 brown twigs. Buds acute, with 5-9 scales : leaves numerous, pale green ; leaflets 7-9, the 

 blades lanceolate or ovate-lanceolate, long-acuminate, with numerous silvery scales beneath, 

 glabrous or nearly so at maturity : rachis pubescent with stellate hairs at least when young : 

 staminate aments slender, 8-12 cm. long : calyx with the middle lobe longer than the lat- 

 eral : fruit subglobose or oval to obovoid-pyriform, the husk rather thin, sometimes tardily 

 splitting : nut flattened, whitish or pale. 



In dry soil, Virginia to Tennessee, Florida and Alabama. 



