CIkixi — Notes on Genera of Panicece. IV. 



143 



Navicularia Raddi, Agrost. Bras. 38. pi. 1. f. 5. 1823. Three species 



are included, N. hirta, N. glabra and N. lanala (op. cit. 40. pi. 1. f. 5). 

 The last-named species, " Invenitur in herbidis prope Rio-Inhumirim ,, , is 



here taken as the type since it is the only 

 one of the three figured in the same 

 work and because Raddi, in his generic 

 description, refers to this figure. We 

 have not seen Raddi's specimen, but 

 from the description and figure we judge 

 it to he the same as Panicum leiocarpum 

 Sprong. (Ichnanthus leiocarpus(Sjpreng.) 

 Kunth), to which Xees (Agrost. Bras. 

 147. 182!>) refers it, or a closely allied 

 species. Raddi proposes the genus be- 

 cause of the peculiar calyx-like structure 

 which is borne on the hermaphrodite 

 floret. 



The genus Ichnanthus has been recog- 

 nized by some authors as valid and by 

 others has been included in Panicum. 

 Trinius at first (Fund. Agrost. 130. 1820) 

 accepts Ichnanthus, even to the " trans- 

 verse" abortive floret, but later (Gram. 

 Pan. 52,53. 1826) he includes it in his 

 Panicum, section Jubaria, with the ob- 

 servation that it is included in Panicum, 

 having, like "Pan. almadense, pseudagrostis, Hofmnnseggii, melicarium" , 

 a hermaphrodite floret appendiculate at the base with a double rudiment. 

 Nees (Agrost. Bras. 14'.). 1820) includes Ichnanthus panicoides, which he 

 here renames Panicum ichnanthum, in Panicum, section Virgata, placing it 

 next after Panicum leiocarpum and P. Hoffmannseggii, species now recog- 

 nized as belonging in Ichnanthus. Nees describes the perfect floret as 

 being embraced at the base by an ovate, appressed, papery, two-parted 

 lamina. 



Kunth (Rev. Gram. 1 : 41. 1829) accepts the genus Ichnanthus with the 

 single original species, and describes the fertile lemma as bearing at the 

 base oblique-oblong, obtuse, glabrous scales decurrent on the pedicel. 

 Later (op. cit. 2 : 245. 1830), while still including but the single, species, 

 Kunth, in his observations, states that the supposed hypogynous scales 

 of authors are analogous to the lodicules which are ordinarily found only 

 at the base of the interior palet (palea) but are here found also and 

 greatly developed, on the exterior palet (lemma). In a later part of the 

 same work (op. cit. 2:508. pi. 168. 1831) he transfers to Ichnanthus 

 Panicum leiocarpum Spreng., a species in which the appendages are promi- 

 nent. Still maintaining the genus solely on account of the appendages 

 at the base of the perfect floret, Kunth (Enum. PI. 1 : 135. 1833) adds 

 Panicum almadense Xees to Ichnanthus. 



Fig. 10. 



Ichnanih us pan icoides. 



(Spikelet and fruit x 7% diam.) 



