8o Our Native Perns. 



ultimate pinnules 2" — 5" long, oval, slightly cordate, coriaceous, 

 the margin of the fertile ones sometimes revolute to the midrib ; 

 veins numerous, parallel. Cal. IV. 



6. P. pulchella, Fee. Stipes densely tufted, 3'— 8' long, chaffy 

 at base, nearly black; fronds 3' — 9' long, 1^—5' broad, triangular- 

 ovate, quadripinnate below, gradually simpler above; lower pinnae 

 deltoid, narrowly triangular above ; ultimate pinnules numerous, 

 i" — 3" long, oval or often cordate-ovate, stalked, coriaceous, 

 smooth, the edges often much reflexed. Western Tex. and N. 

 Mex. V. 



** Pinnules mucronulate or decidedly acute. 

 \ Fronds narrowly linear in outline, usually bipinnate. 



7. P. ternifolia. Link. Stipes tufted, nearly or quite black, 

 2' — 6' long, fronds 4' — 10' long, narrowly Imear ; pinnae usually 

 9 — 15 pairs all but the uppermost trifoliate; segments commonly 

 linear, slightly mucronate, coriaceous, sessile or the middle one 

 indistincly stalked, the edges much inflexed in fertile fronds ; in- 

 dusium broad. Western Tex. V. 



8. P. brachyptera,* Baker. Stipes 2'— 8' long, stout, purplish- 

 brown; fronds 3'— 8' long, narrow in outline from the ascending 

 secondary rachises, bipinnate ;, pinnules, crowded, 2" — 5" long, 

 oblong-linear, simple or trifoliate, acute or mucronulate ; margins 

 inflexed to the midrib in fertile fronds. {P. Ornithopus, var. brach- 

 yptera, D. C. E.) Cal. IV. 



WFronds broader, lanceolate to ovate, bi — tnpinnate. 



9. P. Ornithopus,* Hook. Stipes tufted, 3' — 8' long, rather 

 stout, dark brown ; fronds very rigid 3' — 12' long, 2' — 3' broad, 

 broadly deltoid-lanceolate, bi — tripinnate ; primary pinnae spread- 

 ing or obliquely ascending, linear, bearing 4 — 16 pairs of trifoliate 

 (varying from simple to 5 — 7 foliate) mucronulate, pinnules, lyi" 

 — 2" long; margins inflexed to midrib in fertile fronds. Cal. IV. 



10. P. Wrightiana, Hook. Rhizoma short, thick, densely 

 chaffy ; stipes crowded, purplish-brown, 4' — 6' long ; fronds 3' — 6' 

 long, t' — 3' broad, lanceolate to deltoid, bipinnate; pinnae nearly 

 sessile, spreading; pinnules coriaceous, smooth, nearly sessile, at 

 most about six pairs ; those of the sterile frond oval 3" — "5 long, 

 with a minute cartilaginous point ; of the fertile inflexed to the 

 midrib. Tex., Col. N. Mex., Ariz. V. 



11. P. densa,* Hook. Rhizoma rather slender, chaffy with 

 blackish scales ; stipes densely tufted, wiry, very slender, casta- 

 neous, 3' — 9' long; fronds ovate or triangular-oblong, i' — 3' long, 

 densely tripinnate ; segments 3" — 6" long, linear, nearly sessile. 



