Biological Papers. 113 



651. Echinofioru.s cordifolius Grisebach. {Alisma L ) Upright Bur- 

 head. Waterholes and ditches, general; common. June. (ASU) 



652. Echinodorus radicans Engelm. Creeping Bur-head. Cherokee to 

 Montgomery county; not common. June. (AS) 



653. Lophotocarpus calycinus J. G. Smith. {Sagittaria Eng. ) Variable 

 Lance-head. Water, throughout the state; common. 



654. Lophotocarpus depauperatus Sm. Elliptic Lance-head. Borders 

 of ponds, S. E. K. ; rare. July. (A) 



655. Sagittaria platyphylla Sm. Ovate-leafed Arrow-head. Sloughs 

 and shallow water, S. E. K. ; frequent. July. (ASU) 



656. Sagittaria graminea Mx. Grass-leafed Arrow-head. Mud or shal- 

 low water, S. E. K.; not common. July. (SU) 



657. Sagittaria heterophylla Pursh. Variable Arrow-head. Muddy 

 places, S. E. K.; frequent. July. (ASU) 



658. Sagittaria ambigua Sm. Kansas Arrow-head. Borders of ponds, 

 S. E. K., west to Meade county; frequent. July. (ASU) 



659. Sagittaria longiloba Eng. Long-eared Arrow-head. Shallow 

 water, W. K. ; occasional. July. (AS) 



660. Sagittaria brevirostra Mack. & B. Short-beaked Arrow-head. 

 Sloughs and wet bottoms, Johnson county (Mackenzie & Bush). July. 



66L Sagittaria arifola Nutt. {S. cuneata Sheld.) Arum-leafed Ar- 

 row-head. Shallow water, or deeper, C. and W. K.; occasional. August. 

 (S) Developing laminodia or phyllodia, or both, according to circum- 

 stances. 



662. Sagittaria latifolia Willd. Broad-leafed Arrow-head. Shallow 

 spring water, throughout the state; common. July. (ASU) 



Order XXIV. COMMELINALES. The Dayflowers. 

 Inflorescence in verticils, cymes, spikes, spadices, or solitary, subtended 

 by spathe-like or leaf-like bracts. Perianth of six divisions, heterochlamyd- 

 eous, zygomorphous, partially two-lipped, occasionally the lower lip con- 

 sisting of a single specialized petal. Androecium of stamens. Six partly 

 fertile and partly barren, or three, peculiarly arranged and partly unlike, 

 as though they were portions of two whorls with certain units entirely sui - 

 pressed, the whole in a tube separate from the gynoecium. Ovulary 

 superior; ovules anatropous; seeds one to many; embryo straight, cylindric, 

 central, enantiomorphous (opposite the hilum), in a copious farinaceous en- 

 dosperm. In this order there are many orchidifloral characteristics, though 

 not always clearly evident. 



Family 48. Commelinace^. Spiderwort Family. 

 Jointed herbs from thickened, fibrous roots, with showy flowers in 

 umbel-like cymes subtended by one or more leaf-like or spathe-like bracts. 

 Calyx of three persistent herbaceous green sepals and corolla of three deli- 

 quescent chromocyanic membranous petals, the lower or dorsal one in 

 Commelina rudimentary. Anthesis periodical, morning opening only; flow- 

 ers close about midday. Stamens six, rarely fewer, hypogynous, in two 

 series, two or three fertile, three or four larger and sterile; fertile an- 

 thers bisporangiate, longitudinally dehiscent; sterile anthers larger and 

 -)-(- shaped. Ovulary sessile or nearly so, bilocular or trilocular; ovules 



