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



173 



Ligulce cito evanescentes. Pedunculus brevis (0,5 — 1 cm), demum ca. 2 cm longus et 

 deflexus. Spica brevis subglobosa pauciflora. Pistillum stylo subnullo, stigmate parvo 

 rotundato. Fructus parvus, 1,5X1,5 mm rotundatus erostratus 3-carinatus, carina 

 media prominente subgibbosa. 



This plant of southwestern Australia has 

 been considered to be P. Drummondii. How- 

 ever there must be any misconception, as it very 

 little answers to the description of P. Drummon- 

 dii. It nearly always lacks floating leaves, has 

 recurved short peduncles, quite beakless fruits 

 etc. The epidermis of the stem lacks a strength- 

 ening layer but possesses a full-numbered circle 

 of rather strong strands. In the bark inside 

 it no bundles appear. The central stele has 

 0-endodermis and four free bundles separated 

 by strong bast sheaths and arranged as in the 

 foregoing. 



The style of this species is very slightly 

 developed and the fruit seems to be quite 

 beakless. This fact combined with the above 

 described properties: no floating leaves etc. 

 makes us feel inclined to class this species in 

 a separate group. Principally on account of 

 its stem structure the P. reduncus may be 

 united with the foregoing species. Future 

 researches may possibly alter this arrangement. 



Distribution. S. Western Australia (hb. 

 Stockholm.). On the label Mr. Ar. Bennett 

 has noted: »not been refound. f. Baron v. 

 Mueller; leg. James Drummond ex Muellers 

 etc. and determined it as P. Drummondii Benth. 



Fig. 90. F. reduncus Hagste. A, Habitas-fignre, ■}-. 

 B, Top ot a leaf, ■(. C, Pistil, sideview, ',». D, Fruit 

 from the side, {-. E, Transverse section of the stem, 

 showing the central stele, with two larger median bun- 

 dles, each of them having a xylem canal, the interjacent 

 bast cells, and the subepidermal strands, \^. F, Part 

 of the epidermis with an adjoining channel wall and a 

 bast bundle (more enlarg.). 



P. Clieesemanii Ar. Bennett. 



Journal of Botany, 1883, 66. — Fig. 91. 



Several specimens of this species even from the original station, St. John's 

 Lake, have been examined. They are all characterized by small, ca. 30—35 mm long, 

 rounded, obtuse, or even slightly emarginate, oval, floating leaves, usually appearing 

 already one or a few internodes below the primary spike. The eking piece of 

 the stem consists of a spike-bearing branch. Spikes of middle size; Pollen spheric 

 small-grained; the upper part of the pistil incrassate and the stigma oval, compara- 

 tively small, and covering only the middle portion of the upper surface of the style. 



