Biological Papers. 109 



616. Typha angustifolia L. Narrow-leaf Cattail. Reno county, along 

 the Ninnescah, and elsewhere in southern Kansas; rare. June. (ASU) 



Family 41. Sparganiace.^. Bur-reed Family. 

 Aquatic herbs, with linear, two-ranked laminodia, and with monoecious 

 flowers in dense serial globose clusters (interrupted spadices), axillary to 

 leaf-like spathes. Several upper heads staminate; lower ones carpellate. 

 Ovulary unilocular or bilocular; ovule one. Fruit nutlike, ovoid, or spindle- 

 shaped. 



617. Sparganium eurycarpum Engelm. Broad- fruit Bur-reed. Scat- 

 tered, in wet places, throughout the state. May. (ASU) 



618. Sparganium androcladum Morong. Branching Bur-reed. Scat- 

 tered, in wet places. June. (ASU) 



Family 42. Pandanace^. Screw-pine Family. 

 Greenhouse plants of foreign origin. Several species are raised; only 

 the commonest one is here listed. 



620. Pandanus elegans Du Petit Thouars. Elegant Pandanus; Screw- 

 pine. Frequent in house culture. 



Order XX6. PALMALES. 

 A very extensive order of ligneous arborescent monocotyls, comprising 

 many species, genera, and even families of tropical trees and shrubs of 

 widely different characteristics, some of them of comparatively easy green- 

 house culture, such as (621) Phcenix dactylifera L., the date-palm, of the 

 family (426) Phoenicacese; (622) Cocos weddelliana H. Wendland, a cocoa- 

 palm, and (623) Areca lutescens Bory, a betelnut-palm, and (624) Kentia 

 forsteriana Muell., a feather-palm, all three of the family (42c) Cocacne; 

 and (625) Livistona humilis R. Brown {Latania horbonica Hort.), Bourbon 

 fan-palm, of the family {42d) Sahalacese, belong here. These are the best 

 known; and some of them are often seen outside of conservatories. 



Order XXI. NAIADALES. The Pondweeds. 

 Inflorescence solitary or clustered in the leaf-axils, otherwise spirally 

 arranged in a spike, or borne on a one-sided spadix, the spathe fugacious 

 or disappearing early. Flowers perfect or unisexual, usually monoecious, 

 the carpellate flowers often dimorphous. Perianth single, double, or none, 

 glumaceous or hyaline, often imperfect. Androecium of one to four stamens, 

 with very short filaments or none; anthers with one. two or four sporange.«, 

 and large strap-like or petaloid connectives. Gynoecium of one to several 

 carpels, distinct or united; ovulary superior. Fruit nut-like or utricular. 



Family 43. ZANNlCHELLlACEiE. Pondweed Family. 

 Perennial water-plants, with alternate or opposite leaves floating and 

 submersed, and submerged laminodia, phyllodia, and stipules. Prolamine 

 (blades) of floating leaves entire, of submersed leaves capillarily divided, 

 both on the same plant or otherwise. Flowers in sessile or peduncled spikes 

 (spadices), or in axillary clusters. Perianth very little; sometimes sepals 

 four; but flowers usually enclosed in a fugacious hyaline spathe. Stamens 

 one to four, filaments short; anthers extrorse, two to four sporangiate, the 



