14 CHLORIS BOREALI-AMERICANA. 



2. Ceratiola, Michx. 



Flores in axillis foliorum solitarii vel pauci aggregati, diandri. 

 Perigonium proprium nullum. Stylus crassus: stigma foliaceum 

 circa 4-partitum, lobis inciso-pinnatifidis. Drupa dipjrena. Semi- 

 na erecta : radicula infera C. ericoides, Michx. 



3. Corema, Don. (Tuckermania, Kl. Oakesia, Tuckerm.) 



Flores capitati, bracteis squamaeformibus suffulti. Perigonium 

 proprium nullum. Stylus gracilis, 3- (nunc 4-5-) fidus, lobis an- 

 gustis. Drupa ssepius tripyrena, parva. Semina erecta : radicula 

 infera C. alba, Don. C. Conradii, Torrey ^ Gray. 



Tab. I. Oakesia (potius Corema) Conradii, staminate, pistillate, and 

 fruiting specimens, of the natural size. Fig. 1. Leaves, magnified ; view 

 of the upper and under sides. Fig. 2. Capitulum of the sterile flowers, en- 

 larged. Mg. 3. Magnified staminate flower, with the three inner enveloping 

 scales (corolla, of Klolzsch) spread open (the stamens in this instance four 

 in number). Fig. 4. Magnified staminate flower, with the two innermost 

 scales united on one side. Fig. 5. Pollen (consisting of four combined grains), 

 highly magnified. Fig. 6. A magnified subhermaphrodite flower, with its 

 scales spread open, showing an abortive pistil, and the one-celled anthers ; in 

 one of the stamens there is the rudiment of the second anther-cell. Fig. 7. 

 Enlarged hermaphrodite flower, witli one dimidiate stamen, and two rudimen- 

 tary filaments ; the pistil normal. Fig. 8. Hermaphrodite flower, the sta- 

 mens all with dimidiate anthers. Fig. 9. Capitulum of fertile flowers, enlarg- 

 ed. Fig. 10. Magnified pistillate flower, with the inner scales. jFV^. 11. 

 Magnified pistillate flower, with a four-cleft style, and the scales spread open. 

 Fig. 12. A drupe, cut across, magnified. Fig. 13. One of the detached 

 pyrenae, cut across, and more magnified. Fig. 14. Vertical section of a 

 drupe, magnified ; the section passing through one pyrena, seed, and embryo, 

 and leaving the other pyrena entire. Fig. 15. The embryo detached, and 

 more magnified. 



