eens ok apn . 
. 605. AMBROSIA. L. i.- é = : 
Monoicous.—Masc. Cali patie ® dinthers 
approximate, but not united.” Receptacle naked. 
~-Frem. Calix 1-leaveds entire or 5-toothed, . 
 i-flowered. Corolla none. Mut formed ie x4 4 
, ea calix, 1-seeded. — 
i. % ce Tel bee and mostly anna plentss leaves ugh, 
4 e, bi re: 
me se: ti, eae Ag seep te and 5 
: ywers masculine nu- 
omerated, clusters 
<a 
‘ e* 
3 _Spreies. 1A. integrifolia. 2: bidentata. 3: trifida. 4. 
= (5. artemisifolia. 6. paniculata. 7. heterophylla- 
8B. * tomentota. Perennial; stem low; leaves bipinnatifid, = 
under side white and tomentose; spikes solitary. HaB. 
Im Upper Louisiana on the banks of the Missouri; rare. 
_ Only 1 or 2 feet high. 
a ‘North American genus, with the exception of 1 spe 
= and another indigenous to the sea-coasts of _ 
~ 
“604s XANTHIUM. “A (Clott-bure.) es 
fonoicons.—Mase. Calix imbricated. sine 
seerex ate, buf not united. — - Receptac 
Fes. Calix a 2-leaved involucram, — 
orolla none. Utriculus ede 4 
: ’ led by | spines); flowers spiked, ax: Zz. 
erg oe ry terminal, eos shorty ave masculine. _ 
Species. 1.X. Strumarium. Andigenous to the re- 
si partsof Upper Louisiana. 2. orientale. 3. spine- | 
At this time naturalized from Savannah in Georgi@ 
own in the District of Columbia. v. v. AE 
