EXPLANATION OF PLATES. 



PHYI,I,OSPADIX, PIRATE I. 



A : — stem from pistillate plant (Ph. Torreyi), X Yz. r — /, bases of radi- 

 cal leaves ; /','cauline leaf with empty sheath ; /', /'-, first and sec- 

 ond leaves with axillary spadices ; the old leaf-sheaths are spread 

 open. I and II, the first and second flowering clusters, with inter- 

 node and subtending leaf. Ill, third flowering cluster, terminating 

 the stem, with no subtending leaf, its earliest spathe on the same 

 side as the earliest in II, thereby securing in the bud, the protection 

 of /*. sh\ spathe-sheath enclosing sp\ the lower spathe and spa- 

 dix. sJV^, second spathe-sheath, enclosing sp-, the second spathe 

 and spadix. 



B : — Rhizoma, (natural size), r. I. b., roots, leaf, and branch, numbered 

 through four successive " internodes." The oldest set of roots 

 has rhizoids with adhering sand. 



C : — Diagram ; transection of a pistillate stem, in the bud ; lettered as 

 in A. sx, spadix. 



C- : — Diagram ; longisection of rhizoma, in the bud ; lettered as in B. 



D : — (i) Staminate spadix, at anthesis, (natural size), rn, retinacula or 

 appendages ; sp, spathe ; a, anther-lobes. 



(2) An open anther-lobe, X 3, showing the median membrane. 



(3) A few pollens, arranged as seen in pollen-sac. 



(4) Apices of three pollens (at right), X 700. 



E : — (i) Pistillate spadix (Ph. Scouleri), mature, (natural size), sp, 

 spathe ; sx, spadix ; /, remains of spathe-sheath, remains of a leaf 

 seen below. The retinacula, rn, partly conceal the mature fruits. 



(2) Above, fr, a single fruit (Ph. Scouleri), front view, X 2. 



(3) Same in section, (at the left), showing the point of attach- 

 ment, and the pendulous seed. 



F : — Young pistil (Ph. Torreyi), with stigmas, X 3. 

 PHYI,I,OSPADIX, PLATE II. 



G : — The rudimentary male organs (Ph. Torreyi). 



(i) On the right, spadix, sx, with one partly mature pistil, circu- 

 lar scars where two have been removed, and above, several small 

 ovaries, ov., each with retinaculum, r7i. Pairs of rudimentary an- 

 ther-lobes (joined by the curved connective), alternate with pistils, 

 X 3- 



(2) On the left, a section of very young pistillate spadix, X 120 ; 

 ov., ovary; a, anther lobes; rn, retinacula. The elevation under 

 the anther-lobes is the connective ridge. 



