52 MONOCOTYLEDONE.E. ECHINODORUS. 
minibus 12; fructibus echinatis, carpellis multicostatis, lateraliter uni- 
elandulosis, stylo uncinato aristatis. Alisma ellipticum Mart. in Róm. 
et Schult. Syst. veg. 7, p. 1607; Kunth Enum. 3, p. 153; Seub. in 
Mart. Flor. bras. fasc. 8, p. 107, tab. 13, fig. 4. A. Andrieuxi Hook. et 
Arn. Bot. of Capt. Beechey's Voy. 1839, p. 31. A. pubescens Mart. in 
Róm. et Schult. Syst. 7, p. 1608; Kunth Enum. 3, p. 153. Seub. in 
Mart. l. e. (cum varietate). A. paleæfolium Kunth Enum. 3, p. 152; 
Seub. in Mart. 1. e. Sagittaria paleæfolia Nees et Mart. in Nov. Act. 
Nat. Cur. 11, p. 21; Mart. Syst. mat. med. bras. p. 47. Ech. pubescens 
Seub. in Warm. Symb. 13, p. 345. Species variabilis sed inter formas 
extremas, formæ intermediæ reperiuntur ; Ech. subalato valde affinis 
a quo differt foliis latioribus, lineis pellueidis minus conspicuis, stylo 
breviore, ete. 
9 Plantæ e. 50 cent. alte. Rhizoma horizontale vel obliquum, fibril- 
las radicales validas agens. Petioli erecti, angulati, 15-20 cent. longi: 
limbi 15-18 cent. longi, latitudine variabiles, 5-7 nervii, venis copiose 
et irregulariter anastomosantibus. Scapus erectus, simplex, folia su- 
perans, inter verticillos anguste alatus. Flores in verticillos 8-12. 
remotos dispositi, pedicellis post anthesin recurvis vel etiam arcte re- 
flexis, 15 mill. longis. Bracteæ 20-25 mill. longæ. Perigonium et sta- 
mina E. subalati. Carpella in fructum globosum vel oblongum, crassi- - 
tie pisi domestici, stylis echinatum disposita, singula oblique ovata, ? 
mill. longa, dorso costato-carinata, inter costas uniglandulosa, stylo 
uncinato aristata. Forme vel varietates quatuor in herbariis occurrunt. 
a, latifolia ; folia late ovata, basi emarginata vel sinu lato cordata. 
circa 20 cent. longa, 15 cent. lata. 
B, pubescens; folia ovata, basi emarginata, vel subcordata, 15 cent. 
longa, 10 cent. lata; scapus superne, bracteæ, pedicelli et sepala sca- 
bro-pubescentia (A. pubescens Mart., A. paleæfolium Mart.). 
y, ovata; planta elatior; folia ovata, utrinque attenuata, basi sensim 
in petiolum decurrentia, apice breviter acuminata (A. Andrieuxi 
Hook. et Arn.). 
P. 3, minor (Seub. in Mart. 1. c.); planta multo minor, foliis quinque- 
nerviis, scapo incurvo vel flexuoso; an forma terrestris ? 
In America calidiore a Mexico ad Brasiliam centralem. Var. o, prov. 
Piauhy (Gardner n. 2739in herb. Kew); var. 8, Bahia (Blanchet n. 3155 
et n. 3518 in herb. Candoll.), Rio dos Ilheos (Prinz Max. Vidensis ii m 
herb. Martii; hoc specimen sub nomine A. paleæfolii descriptum non 
differt nisi pedicellis paullo brevioribus); var. y, in Mexico prope Lizardo 
