178 
7 .2, LUDWIGIANTHA. 
: on tiedae section J wealeeon ating ‘eG Fe NA YT: ba 
1840. | 
1. LUDWIGIANTHA ARCUATA (Walt.). 
Ludwigia arcuata Walt. F). Car. 89. 1788. 
Ludwigia pedunculosa Michx. F\. Bor. Am. 1: 88. 1803. 
Isnardia pedunculosa DC. Prodr. 3: 60. 1828. 
Swamps and marshes, Virginia to Florida. 
3. LUDWIGIA LL Sp. PL ris. 175%. 
Represented by fifteen species in the southern United States. 
An ecological Study of the Genus Talinum with Descriptions of two 
Species. 
By J. W. HARSHBERGER. 
(PLATE 299.) 
There are admitted by Engler and Prantl in their voluminous 
work, “ Die Natiirlichen Pflanzenfamilien,’ seventeen genera of 
the family Portulacaceae, and, according to the Index Kewensis, 
the distribution of the species of these several genera is as follows: 
Number | Western Hemisphere in- | Eastern Hemisphere in- 
Genus. ae cluding N. and S. Ameri- | cluding Asia, Africa, Eu- 
Species. ica and Islands. rope and Oceanica, 
1. Talinum,.. . 30 25 5 
2. Calandrinia . . 125 100 25 
3 ‘Spragnea .. .-. 2 2 — 
4. Calyptridium, 3 3 sini 
5. Talinopsis. . . I I pee 
6. Pleuropetalon . 2 2 — 
7. Grahamia. . , I © — 
8. Anacampseros , 12 — 12 
g. Claytonia . . 25 21 4 
10. Hectorella. 2 _ 2 
13. Montia. 2... — — li 
12. Monocosmia. . 2 2 Ps 
54. Silvaes 2 2, 4 4 eas 
14. Portulacaria , . 2 ae 2 
15. Talinella . . 1 _ I 
16, Portulaca . . . 54 20 34 
27, Lewis 2. 2 2 aie 
268 183 85 
