— 27 — 



This group includes S. decnmhens the common form of which as 

 proved by Koernicke 1890 (p. 146) is cleistogamous, but which also 

 has a marked chasmogamic form described by Hackel 1902 (p. 146). 

 Both authors only speak of the ordinary epiterranean panicle. 



Dantiionia hreviaristafa too has a chasmogamous and a cleisto- 

 gamous form. Vierhapper (pag. 146). 



Group 3. „Arten, von denen bisher nur kleistogame Individuen 

 beobachtet wurden (p. 149)". 



Group 4. „Amphigame Arten (pag. 180). Jedes Individuum 

 erzeugt sowohl chasmogame als kleistogame Archen in gesonderten 

 Infloreszenzen , die chasmogamen in einer endstandigen Rispe, die 

 kleistogamen in seitlichen, von den Blattscheiden ganz oder fast 

 ganz verhiiUten Rispen oder endlich an der Spitze grundstandiger 

 Auslaufer, die in den Boden dringen". 



Group 4 includes about eight species of which especially two 

 deserve attention on this occasion. The first is Amphicarpus Purshii 

 a native of America described by Pursh as early as 1814 (p. 82). 

 The primary inflorescence in this plant is chasmogamous, but is said 

 not to develop ripe fruits. At the base the culm sends out very 

 slender, subterranean stolons ending in a single, cleistogamous, spi- 

 kelet, which is fertile. 



In Chloris clandestina (Scribn. & Merrill) the chasmogamous and 

 cleistogamous inflorescence differ if possible still more than in Am- 

 phicarpus. The chasmogamous spikelets in the terminal panicle res- 

 emble the general Chloris type; they produce seed as usual. But 

 from their bases the culms extend runners creeping along the 

 ground not rooting and not intruding in the soil ; These runners 

 send out two rows of branches and subbranches some of which 

 end in a pale, solitary, cleistogamic spikelet which differs in every 

 character of shape from the spikelets in the terminal panicle so 

 much , that if you did not see them rise from the same root you 

 would not place them in the same species not even in the same 

 genus, Hackel says. 



To these two amphicarpous species I can add Sieg- 

 lingia decnmhens. 



As for the specimens examined (altogether some two three 

 hundred culms) they have been collected on Amager Faelled at 

 Copenhagen, at Loenstrup in the north west of Jutland and at 

 Ring Sjoen in Sweden. In the amphicarpous tendencies the plants 

 from these far apart places seemed quite alike. 



