CELL-CONTENTS AND FORMS OF CELLS. 191 



ceae (also in the form of octahedra and small acicular crystals), 

 Bixaceae, Bruniaceae, Burseraceae, Buxaceae (also styloids and 

 micro-crystals), Cactaceae, Canellaceae, Capparidaceae, Caprifolia- 

 ceae, Caryophyllaceae, Casuarinaceae, Celastraceae, Combretaceae, 

 Convolvulaceae (also small acicular crystals), Cornaceae (also 

 micro-crystals), Ebenacese, Ericaceae, Euphorbiaceae, Fagaceae, 

 Geraniaceae (also raphides), Guttiferae, Hamamelidaceae, Hippo- 

 castanaceae, Hypericaceae, Juglandaceae, Lecythidaceae, Linaceae, 

 Loganiaceae, Loranthaceae, Lythraceae, Magnoliaceae, Malpighia- 

 ceae, Malvaceae, Meliaceae, Menispermaceae (also small acicular 

 crystals), Moraceae, Myricaceae, Myrsinaceae, Myrtaceae, Oleaceae, 

 Passifloraceae, Pittosporaceae (also columnar crystals), Platana- 

 ceae, Plumbaginaceae, Podostemaceae, Polygalaceae, Polygonaceae, 

 Portulacaceae (also micro-crystals), Rhamnaceae, Rhizophoraceae, 

 Rosaceae, Rubiaceae (also raphides, micro-crystals, rhombohedra, 

 and small acicular crystals), Rutaceae (also styloids and raphides), 

 Salicaceae, Santalaceae, Sapindaceae, Sapotaceae (also micro-crys- 

 tals), Saxifragaceae, Simarubaceae, Solanaceae (also micro-crys- 

 tals), Staphyleaceae, Sterculiaceae, Theaceae (also raphides and 

 styloids), Thymelaeaceae (also micro-crystals), Tiliaceae, Ulmaceae, 

 Umbelliferae, Urticaceae, Vaccinaceae, Verbenaceae (also small 

 prisms and acicular crystals), Violaceae, and Zygophyllaceae. 



Solitary rhombohedra are found in a relatively few families 

 and are characteristic of the following: Connaraceae, Crassulaceae, 

 Cucurbitaceae, and Leguminosae. 



II. Crystals in the tetragonal system occurring in the form 

 of small octahedra or prisms, as twin-crystals, and in the form of 

 short rods or needles are found in the following families : Acera- 

 ceae, Apocynaceae, Araliaceae, Aristolochiaceae, Begoniaceae, Big- 

 noniaceae, Boraginaceae, Cactaceae, Caesalpinaceae, Calycanthaceae, 

 Campanulaceae, Canellaceae, Capparidaceae, Chenipodiaceae, Com- 

 positae, Convolvulaceae, Gentianaceae, Gesneraceae, Guttiferae, Lau- 

 raceae, Loganiaceae, Magnoliaceae, Melastomaceae, Menispermaceae, 

 Moraceae, Myristicaceae, Monimiaceae, Oleacese, Papilionaceae, 

 Phytolaccaceae, Piperaceae, Polemoniaceae, Ranunculaceae, Rubia- 

 ceae, Saxifragaceae, Scrophulariaceae, Simarubaceae, Solanaceae, 

 Sterculiaceae, Styracaeeae, and Zygophyllaceae. 



