KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 55. N:0 5. 



165 



The species belonging to this group develop their fruits, like tlie Javanici, 

 with protuberances on the keels and sides, for which a disposition can be observed 

 already on the ovaries. As, besides, the styles are also more conspicuous, the 

 ligules stronger, the coriaceous leaves often short-petioled and more roundish-obtuse, 

 and the stem alvvays furnished with numerous cortical strands, but usually no hypo- 

 dermatic layer etc., the group is easily distinguished from the next foregoing. It 

 seems to be a special Australian group, although, interesting enough, a South-American 

 species also, and probably P. mexicanus (= P. montanus Presl?), of Mexico, belong hereto. 



Of P. si milis Ar. Bennett, see under P. Cheesemanii. 



P. muricatns n. sp. 



Caulis teres, 2—3 mm crassus, simplex, sed a spica primaria ramis ] :a>— 2:ae 

 ordinis spiciferis prolongatus, ca. 0,5 m altus, internodiis 2 — 5 cm longis. Folia in- 

 feriora membranacea ovato-lanceolata, 60 — 80 X 25—30 mm, breviter petiolata, petiolo 

 lato ± 5 mm longo, obtusa integerrima 11 — 13-nervia, nervö medio reticulata; na- 

 tantia coriacea ovalia— ovato- vel subcordato-ovalia — subcordato-rotundata, 45 — 

 50 X 25—30 vel 45—65 x 35—45 

 mm, apice obtusa vel subretusa, 

 17—23 — 27-nervia, petiolata, petiolo 

 lamina breviore ± 25 mm longo 

 valido, jam infra spicam primariam 

 4 evoluta. Ligulse membranaceöe 

 caduca? bicostatse, costis humilibus, 

 ad basin loculis oleiferis annula- 

 tim instructse. Pedunculus crassitie 

 caulem sequans, 35 demum ad 60 

 mm longus. Spica sub anthesin 

 densa, 25 mm longa, deflorata 50 

 mm, multiflora. Appendices stam. 

 late cuneatse. Pollen spha3roideum, 

 magnitudine media. Pistillum stylo 

 elongato superne incrassato, stig- 

 mate parvo ovali. Fruetus rotunda- 

 tus rostratus, 3 X 2,25 mm, tricari- 

 natus carinis cristatis, lateribus 

 impressis superne muricatis. — 

 Fig. 82. 



.«3S 



O 



V 





ep 



StT 



At first I thought this plant „. co D 



L Fig. 82. P. muricatus Hagstr. A, 1. Floating leaves, 2, snbmersed 



tO be ideiltic With P. SldcatUS leaf, ;. B, Fruit, side-wiew, f. C, Pistil, a, lateral view, b, from the 



B, . , . , „ ventral side, c, from above, 'j 9 . D, Part of a transverse section of tbe 



ENN., WillClI alSO IS a member OI stem, \°, ep, epidermis, st>; snbepid. strands, i, interlacnnar bnndles, Ib, 



tllis OTOUD It must llOWPVer be l atcni1 bnndles, tr, triobundle, dr, opposite bnndle of the central stele. 



