92 EIGHTEENTH REPORT. 



L. alpiiniin ami L. complanatuiii are uot more pronounced than 

 those between L. obscurum and L. dendroideuni, yet the former 

 are generally considered as distinct species and the two latter as 

 one and the same thing. As a matter of fact the distinctions are 

 even less pronounced for L. alpinum shows both kinds of leaves on 

 the same })lant while the spikes of L. complanatum u\nj be sessile 

 as in L. alpinum. the extremes appear t6 be distinct enough but 

 a coni]»lete series of intermediates connect one Avith the other. L. 

 alpinum has priority of place in the Species Plantarum but since 

 this species has been reduced to a variety of L. complanatum, the 

 latter, according to Article 46 of the Vienna Rules, must be con- 

 sidered as the type. 



Key to the varieties of L. complanatum. 



Plants with dorsiveutral branchlets, leaves 4 ranked, appressed — 

 in the dried plant. 



Branchlets 2-4 mm. wide, very flat, leaves unequal. 

 Branchlets elongated, loosely ascending. 



Peduncles single, 3-12 cm., spikes 2-(i — Lycopodium com- 

 planatum. 

 Peduncles, 1 or 2, 1-5 cm., spike solitary — Lycopodium com- 



plantum var. Sabinaefolium. 

 Peduncles obsolete, spike solitary and sessile — Lycopodium 

 com])lanatum var. Pseudoalpinum. 

 Branchlets short, crowded, forming funnels (fan shaped when 

 dried). 



Peduncles single, 3-6 cm., spikes 2-6 — Lycopodium complana- 

 tum var. flabellatum. 

 Peduncles similar, spike solitary — Lycopodium cDmjdana- 

 tum var. Wibbei. 

 Branchlets I/2 nim. wide, biconvex, leaves nearly equal. 



Leaf tips of lateral rows erect — Lycopodium complanatum var. 



Chamaecyparissus. 

 Leaf tips of lateral rows widely spreading — Lycopodium com- 

 planatum var. Sharonense. 

 Plants with both dorsiveutral and terete branchlets, leaves 4-ranked, 

 not appressed, spike sessile — Lycopodium com]danatum var. al- 

 pinum. 

 Plants with terete branchlets. leaves in 5 ranks, equal, ascending, 

 spikes solitary on ])eduncles less than 1 cm. — Lyco])odiuni com- 

 idanatum var. Hitchense. 



