Flora of North America species comparison

produced in 2–3 pseudowhorls at end of annual growth;

gemmae 3.5–5 × 3–4 mm, lateral leaves 1.25–1.75 mm wide, acute with acuminate tip.

produced in 1 pseudowhorl at end of annual growth;

gemmae 4–5 × 3–4.5 mm, lateral leaves 1.5–2 mm wide, broadly acute.

erect, determinate, 12–18(–25) cm, clustered to long-decumbent, to 8 cm;

leaves in mature portion smaller than leaves in juvenile portion;

annual constrictions absent;

juvenile growth sharply down-curled forming ± 1/2 circle, leaves at tip appressed to form pointed apex.

erect, indeterminate, 8–12 cm, becoming short-decumbent;

leaves of mature portion slightly smaller than leaves of juvenile portion (more pronounced in sun form);

indistinct annual constrictions present (more pronounced in shade form);

juvenile growth erect.

in juvenile (proximal) portion spreading-reflexed (shade) to appressed-ascending (sun), in mature (distal) portion spreading-ascending (shade) to appressed-ascending (sun), light green to yellow, lustrous;

leaves in juvenile portion narrowly lanceolate, parallel-sided, 4.5–7 mm;

leaves in mature portion triangular, widest at base, 3.5–5.5 mm;

margins entire;

stomates present on both surfaces, numerous, 35–80 per 1/2 leaf on adaxial surface.

spreading-ascending (shade) to appressed-ascending (sun) in mature portion, more reflexed in juvenile portion, green (shade) to yellow-green (sun), lustrous;

largest leaves triangular, widest at base, 4–7.5 mm;

smallest leaves lanceolate, 3.5–5 mm;

margins almost entire, papillate;

stomates on both surfaces, numerous on adaxial surface, 30–90 per 1/2 leaf.

25–34 µm.

29–37 µm. 2n = 268.