MONOCOTYLEDOXOUS OR ENDOGENOUS PLANTS. 525 



two sterile flowers, which are reduced to single slender 

 filaments bearing a 2-ceUed anther^ and a single sessile 

 1-celled ovarii, which forms in fruit a 1-7-seeded utricle ; 

 embryo straight, in the axis of fleshy albumen. 



LEMNA, L. Duckweed. 



Spathes marginal, 3-flowered; anthers opening trans- 

 versely; stigma funnel-form ; ovules erect from the base of 

 the cell, anatropous or half-anatropous ; stems increasing 

 by lateral buds ; roots terminating in a calyptre-like ap- 

 pendage. Th.Q jioivers of these plants are seldom seen. 



L. MINOR, L. Stems pale, round-oboyate, flattened, single 

 or variously clustered ; root single ; ovule solitary, half- 

 anatropous ; seed horizontal. Pools, ditches, etc. ; com- 

 mon near the coast. Stems l"-2" long. 



L. POLYRHIZA, L. Stems roundish or obovate, flat and 

 pale above, convex and dark purple beneath, clustered ; 

 roots numerous, clustered; ovules 2. Ponds; less com- 

 mon than the preceding. Stems 2"-4" long. 



129. CAT-TAIL FAMILY. Order, Typhace^. 



Simjyle-stemmed marsh herbs, with elongated strap-shaped 

 nerved leaves^ and monoecious flowers, on a globular or 

 cylindrical spadix, destitute of floral envelopes, but envel- 

 oped in copious pappus-like hairs or scales ; spathe bract- 

 like or none; anthers single or 2-4 together, on long and 

 slender filaments; ovary 1-celled, with a single suspended 

 anatropous ovule; style slender; fruit nut-like; embryo 

 straight in copious albumen; sterile spadix placed above 

 tlie fertile, continuous or distant. 



TYPHA, Toum. Cat-tail. 



Flowers densely crowded on a long C3'lindrical terminal 

 spadix, enveloped in copious pappus-like hairs ; the sterile 



