MONOECIA. POLYANDRIA. 221 



Calix 4-clcft, superior. Corolla none. Stifles 

 none. Stigma partly discoid, 4-lobed. Fcri- 

 carp 4-valved. JVut subquadranguiar, even. 



Large trees with alternate and unequally pinnated 

 leaves; flowers polyg-amous, contemporaneous, (the same 

 bud includin.sf botli sexes together with leaves); female 

 ones terminal, male amenls below the leaves, trifid, pe- 

 dunculate and pendulous; anthers pilose, didymous; nuts 

 edible or bitter. Pubescence stellate. 



Species. 1. C oUvjeformis. (Pecm nut.) 2. sulcata. 

 Obs. Leaflets 5 to 9, oblong-lanceolate, acuminate, ser- 

 rate, under side pubescent, terminal leaflet subpeliolate, 

 attenuated at the base. Male aments 3-parted, very lon^,' 

 pedunculate and smooth; scales 3-parted, incurved, the 

 central segment longer and acuminated. Stamina 4 to 6; 

 anthers didymous, sessile, pilose and chartaceous, some- 

 rimes subtended by an inner calicine scale from the ra- 

 ciiis. Female calix 4-cleft. Corolla none. Style none. 

 Stigma discoid, 4-lobed, 2 of the lobes larger and bifid, 

 summits comjiressed, externally lacerate. 



2. aljci. 4. tom:7itosa. Oes. Ameiits '.rifid, Involucrat?, 

 very long and hlrsutely villous, scales 3-parted, subequal; 

 anthers 3 or 4, pubescent. Female calix 4-cIeft. Corolla 

 none. Stigma as in the preceding. ,3 * maxima. Leaf- 

 lets by 7's, ovate-lanceolate, acuminate, serrulate, beneatk 

 softly pubescent and paler col )u:-ed, terminal leaflet sub- 

 petiolate; fruit parily globose, pericarp exceedingly thick:, 

 nut quadrangular, very large and thick shelled, mucra 

 quadrangular, exserted and truncate. Hab. A few mile* 

 from Philadelphia. Fruit nearly twice the ordinary size? 

 as large as an apple. 



5. * microcarpa. Leaflets about 5, oblong-lanceolatc», 

 sharply serrulate, and conspicuously acuminate, on both 

 sides smooth, beneath glandular, terminal leaflet subpe>- 

 tiolate; fruit subglobose, pericarp thin; nut partly quad- 

 rangular, small and rather thin shelled, mucro obsolete, 

 truncate. Hab. On the banks of the Schuylkill, in the 

 vicinity of Piiiladel})hia.— A large tree with an even bark. 

 Fruit much like that of C. tomentosa, and eatable, but very- 

 small, the nut nat exceeding the size of a nutmeg* 

 Aments trifid, very long and smooth, without involucrum; 

 scales 3-parted, lateral segments ovate, the central one 

 linear; anthers pilose, mostly 4, sometimes 3 and 5. Fe- 

 male 2 or 3 together, common peduncle bracteolate; seg- 

 ments of the calix very long and somev/hat fohaceous. 

 Corolla none. Style none. Stign^-a discoid, 4'lobed^ 



