Pammel — Caryopsis and Endosperm of some Grasses. 217 

 SYNOPSIS OF ANATOMICAL CHARACTERS FOR TRIBES. 



The following synopsis of the tribes studied by myself, 

 including those studied by Harz, gives the chief anatomical 

 characters of the fruit and seed. 



Oryzeae. 

 Starch grains compound. Aleurone cells small, one or two rows. Testa 

 but slightly developed. Oryza, Zizania, Leersia. 



Maydeae. 

 Starch grains simple, solidly packed. Aleurone cells a single row. 

 Testa and pericarp but slightly developed in Euchlaena, Goix. In Zea, peri- 

 carp greatly developed, testa less so. 



Andropogoneae. 

 Starch grains simple. Andropogon Ischaemum, Sorghum vulgare. Aleu- 

 rone a single layer of cells. Testa with large cells, especially in our common 

 forms of Sorghum. 



Paniceae. 



Starch grains simple, solidly packed in Panicum, Setaria; more loosely in 

 Cenchrus. Aleurone cells a single row. Testa and pericarp slightly developed. 



Phalarideae. 

 Starch grains compound. Aleurone cells a single row. Testa and peri- 

 carp but slightly developed. Phalaris, Anthoxanthum, Eierochloe. 



Agrostideae. 

 Starch grains compound in Agrostis, Calamagrostis, Ammophila, Alopecu- 

 rus, Phleum? Stipat in Aristida, simple. Pericarp and testa slightly de- 

 veloped, except Ammophila. Aleurone cells a single row. 



Aveneae. 

 Compound starch grains, Avena, Arrhenatherum t Aira, Holcus, Deschamp- 

 sia, Trisetum. Aleurone cells one or more rows. Pericarp and testa vari- 

 able, usually not greatly developed. 



Chlorideae. 

 Compound starch grains, Cynodon. Bouteloua? Aleurone cells one or 

 more rows. Testa and pericarp but slightly developed. 



Festuceae. 

 Compound starch grains, Phragmites, Arundo, Melica, Poa, Glyceria, 

 Festuca. — Scholochloa, Koeleria, in part. Simple, Dactylis, Bromus, Brachy- 

 podium, Festuca, Scholochloa. Aleurone cells one or more rows. Testa and 

 pericarp not greatly developed. Nucellus pronounced in Bromus, Festuca, 

 Brachy podium. 



Hordeae. 



Simple grains, Hordeum, Secale, Triticum, Elymus, Agropyron, Aegilops. 

 Compound, Lolium, Nardus. Aleurone usually a single row. Nucellus very 

 evident in Lolium, Elymus. Testa and pericarp not well developed. 



Bambuseae. 

 Starch grains compound. Aleurone layer of more than one row of cells. 

 Pericarp well developed. Testa less. Arundinaria. 



