440 MYRMECODIA 



hypocotyl swells into a small parenchymatous tuber, and in this, in 

 an axial direction, there appears a hollow cylinder of phellogen which 

 proceeds to form cork on its inner side and parenchyma on the outer, 

 thus adding to the bulk of the tuber and at the same time forming in 

 it a hollow space (for the tissue within the cylinder of cork dies and 

 dries up) open to the surface. Near the outer surface of the tuber is 

 a phellogen layer acting in the ordinary way, forming a bark. As the 

 tuber grows more pliellogens appear like the first, adding more paren- 

 chyma and forming new cavities which are always in communication 

 with the old. It has not been proved that the ants are of any service 

 to the plant (see Acacia, Cecropia). The tuber is perhaps a water- 

 storage apparatus. 



MyrmecopMly, symbiosis with ants, cf. Acacia, and Bambacaceae, 

 Cecropia, Clerodendron, Cuviera, Duroia, Humboldtia, Hydnophytmn, 

 Korthalsia, Macaranga, Maieta, Myrmecodia, Nauclea, Rubiaceae, 

 Triplaris. 



Myrmedoma Becc. Rubiaceae (n. 5). i New Guinea. Epiphytic. 



Myrmephytum Becc. Rubiaceae (n. 5). i Celebes. Epiphytic. 



Mynnidone Mart. Melastomaceae (i). 2 trop. S.Am. 



Myrobalans (gall-nuts), astringent fr. used for tanning and in medicine : 

 chebulic -, Terminalia Chebula Retz. ; emblic -, Pkyllanthus Em- 

 blica L. 



Myrobalanus Gaertn. = Terminalia L. p.p. (Combret.). 



Myrocarpus Allem. Leguminosae (in. i). 2 Rio de Janeiro. Yield 

 a balsam like balsam of Peru. 



Myrodia Sw. (Quararibea p.p.EP.). Bombacaceae (Sterculiaceae j5//.). 

 7 trop. Am. 



Myrosma L. f. Marantaceae. 8 S. Am. 



Myrospermum Jacq. Leguminosae (in. i). i trop. Am., W.I. 



Myrothamnaceae (EP., Hamamelidaceae p.p. BH.}. Dicots. (Archichl. 

 Resales). Only genus Myrothamnus (q-v.). 



Myrothamnus Welw. Myrothamnaceae. 2 Afr., Madag. Xero. shrubs 

 with opp. 1. and spikes of achlam., reg. , dioec. fl. i 4 8 sta. ; G 

 (4 3). Septic, caps. Endosp. 



Myroxylon J. et G. Forst (Xylosma Forst. f.). Flacourtiaceae (4). 

 45 trop. (exc. Afr.). 



Myroxylon L. f. (Toluifcra L.). Leguminosae (in. i). Strop. S.Am. 

 M. Pereirae Klotzsch yields the medicinal balsam of Peru, M. tolui- 

 f<ra H. B. et K. the balsam of Tolu, from incisions. 



Myrrh, Cominiphora, Myrrhis. 



Myrrha Mitch. Umbelliferae (inc. sed.). Nomen. 



Myrrhidendron Coulter et Rose. Umbelliferae (in. 6). i Costarica. 



Myrrhidium Eckl. et Zeyh. = Pelargonium L'Herit. p.p. (Geran.). 



Myrrhinium Schott. Myrtaceae (i). 3 trop. S. Am. Ed.fr. 



Myrrhis (Tourn.) L. Umbelliferae (in. 2). 2 Eur., Chili. M. odorata 

 Scop, in Brit, (sweet cicely or myrrh), sometimes a pot-herb. 



Myrsinaceae (EP.', BH. incl. Theophrastaceae). Dicots. (Sympet. Pri- 

 mulales). 32 gen., 950 sp., chiefly trop. and subtrop. ; a few reach 

 Cape Col. and N.Z. Shrubs and trees with alt. 1. often in rosettes, 

 usu. leathery, entire, exstip., with resin -passages in their tissues. Fls. 

 in racemose infls., with 2 bracteoles, $ or unisexual, actinomorphic, 



