62 



103. SELAGINELLA. 



».». Sporophylla heteromorphous, the spikes therefore flattened, 

 broader than thick. A', b. Heterostachyti. 



a. Shoots decumbent, at best ascending towards the apex'; 

 root-fibres generally extending to the higher nodes. 

 b. Small species; rachises under 6 mm. broad including 

 the lateral leaves; stems at the utmost 1 mrh. thick. 



A\ b'. Mnferteaetae. 



h.h. No small species ; rachises more than 6 mm. broad 



including the lateral leaves, or the stems at least 1 mm. 



thick. A\ b^ JBUulcatae. 



a.«. Shoots erect, or ascending from a trailing base ; root-fibres 



mostly confined to the lower nodes. 



f. Small or middle-sized species; stems under 1 mm. thick, 

 or the root-fibres confined to the lowest portion. 



A', b^ Suhefotae. 



•j-.f. Large or middle-sized species; stems more than 1 mm. 



thick, the root-fibres not confined to the lowest portion. 



A\ b''. Bfachystttchyae. 

 ±.±. Stems 3— 9-stelical. A^ PLEiOSTELICAE. 



A'. MONOSTELICAE. 



a. Hoinueostacliys. 1. ttosuUmtea. 



M. Leaves proportionally shortly cuspidate. 

 £.1. Leaves proportionally long-cuspidate. 



(1) S. convolvens. 



(2) S. tamariscina. 



(1) S. convolvens, v. a. r. n.. Bull. Btz., 1913, XI, 23; S. 

 involvens, Spring (not Hieron.}, Mon., II, 63; Bk., Fern All., 87; (not 

 Lycopodium involvens, Sw.). 



Main stem short or elongate, erect; branches erect, densely tufted, 

 cuneate in outline, 5 — 15 cm. long, branched down nearly or quite to 

 the base, the branching of all grades between flabellate and 2 — 3-pinnate. 

 Leaves heteromorphous; of the lower plane crowded, ascending, broadly 



