52 Materials for a Flora of the Malayan Peninsvla. 



Species 2. Xorth temperate zone, 



A. CALAMUS, l.sp. PI. 324. Leaves 3 to 6 feet tall, f to 1^ 

 inch wide. Peduncle 19 inches. Spathe G to 30 inches long acu- 

 minate. Spadix green 2-4 inches long cvlindric obtuse, Roxb. Fl. 

 Brit. Ind. II. 169, Don. Griflf. Xotul. As. III. 157. Ic. PI. As. t. 

 162. Engler Arae. 217. Hook. fil. Fl. Brit. Ind. YI. 555. A. 

 Gri/pfhii and A. nilafjhircnsis, Schott. Oestr. Bot. Zeitschr. (1858) 

 35;; (1859) 101. Prodr. 579 and 580. A. BeJangeri, Schott. Ann. 

 Mus. Lugd. Bat. I. 284. Cultivated and in old cultivated ground 

 all over the peninsula but seldom flowering. Xative name " De- 

 ringu " and " Jeringu," the rhizome is extensively used in native 

 medicine and magic. Distribution nearl}^ the whole world. 



XXII. LEMXACEAE. 



Minute or vcr}' small flowering plants, scale-like green, rootless 

 or bearing one or more slender roots from the under side of the 

 frond. Flowers minute 1 to 3 naked or in a spathe. Perianth none. 

 Stamens 1 or 2 with 1 or 2 celled anthers, ovary flask-shaped 1 

 celled. Seeds one or more. 



Fronds with one or more roots. Flowers lateral . . 1. Lenina. 

 Fronds minute rootless. Flowers on the upper sur- 

 face . . . . . . . . . . , . 2. ]Yolffia. 



1. Lemna, L. 



Fronds with one or more roots from the under surface. Flow- 

 ers one or more in a spathe on the edge of the frond. 



Species about ; whole world. 



Eoots solitary. 



Frond elliptic asymmetrical . . . . 1. L. paucicoslata. 



Frond ovoid acuminate . . . . . . 2. L. tenera. 



Koots several. Frond orbicular .. 3. L. polijrrhizn. 



1. L. PAUCTCOSTATA, Hegclmaier Lemnae 139. t. 8. Pools 

 solitary, frond asymmetrical elliptic or ovate j^ inch long. Spathe 

 truncate. Stamens 1-2 with 3 cells. Pistil very short flask-shaped 

 truncate. Ovules solitarv. Hook. fll. Fl. Brit. Ind. VI. ^)-^(). L. 

 minor, Clriff'. Xotulae III. 216. 



Singapore Garden Lake (Pidley 7), Ang Mo Kio; Pahang: 

 J\'kan (Pidley) ; Malacca well in Pesidency Garden; Province 

 Wellesley: Permatang Bcrtam (Pidley 7011). Distrib. Tropics 

 generally. The commonest species here, abundant in ditches. 



2. L. TENERA, Kurz. Journ. As. Soc. Beng. XL. 18n. II. 78. 

 Poot solitary. Fiond thin ovate acuminate or lanceolate, with one 

 or two younger ones budding ofl" from the side, | inch long. 



