504 TWO NEW DICGCIOUS GRASSES OF THE UNITED STATES. 
the terminal spikelet in the staminate spikes of Buchloé (see Pl. XIII. Fig. 8). This terminal spikelet, which, from 
its position, cannot be oblique, is, in Monanthochloé, all that is left. 
The elongated feathery stigmata, protruding from the apex of the flower, are found in all three of the genera 
mentioned, as alas in Spartina and other chlorideous grasses, though not in all of ther 
The principal difference of Monanthochloé and Munroa from Chloridee proper, ‘sla in their spikelets 
being terminal or arranged on a terminal rhachis, and not on lateral more or less digitate spikes. If this dif- [440] 
ference should be deemed too important to let them stand in this alliance, they must be classed with Sesleriew, a 
tribe already distinguished by Koch in his German Flora, but since overlooked by the latest writers on grasses, though 
so well characterized and distinguished from Festucee by the flowers being arranged in terminal, sometimes one-sided 
spikes, and by the elongated stigmata protruding from the apex of the flowers. 
EXPLANATION OF PLATES. 
BucHLOE DACTYLOIDEs. 
Plate XII. Fig. 1. A female plant with stolons, in fruit. 
Fig. 2. A larger and a smaller stalk with male spikes 
Fig. 3. A specimen bearing both male and female flowers. These figures are of natural size; all the others are 
more or less magnified 
Fig. 4. An unusually short staminate spike in the position of the pistillate spike at Pl. XIV. Fig. 3, and with 
scarcely more spikelets, to show the analogy of both 
Fig. 5. Diagram of the same. 
Fig. 6. A two-flowered spikelet, seen from the inside of the spike, so that the lower glume is exhibited. 
Fig. 7. A tri-flowered spikelet ; 
Fig. 8. Terminal spikelet of a aia ag larger lower glume. 
Fig. 9. Flower open, with the stamen 
Fig. 10, a, b, c. Different forms of he lower glume. 
Fig. 11, a, 6, c. Same of upper glume; c shows an eS 7 with a secondary nerve, —a rare occurrence, 
found occasionally in specimens from Fort Kea 
Fig. 12. Lower palea: a, of the lower flower, midrib ees en into a point ; 4, of the upper flower, blunt. 
Fig. 13. Upper palea: a, from the inside and partly folded, showing also the scales ; 6, same, unfolded, also 
with the scales ; c, same, from the upper flower, both nerves at ak snitch closer than in the lower 
flower 
Plate XIV. Fig. 1. Two dada in flower, in their natural position ; the involucral leaves somewhat opened. 
Fig. 2. vee of the lower of these heads, a; the upper head, b, has also 3 fertile flowers, but their ar- 
ngement is exactly reversed. 
Fig. 3. An eae head with 5 fertile flowers, showing their arrangement in a one-sided spike; a, the 
eae glume of the lowest spikelet; b, lowest spikelet, as well as d and f on the off side of the rhachis ; 
cand e, two Some ng eErgg with these, on the near side of the rhachis ; g, last sterile glume, 
the rudiment of the flo 
Fig. 4. Diagram of same ; the nei tee with those in the last figure [441] 
Fig. 5. Rhachis of 3 spikelets, with the base of 2 involucral leaves, in the ait of the lower one a bud. 
Fig. 6. Lower and upper glume of the lowest spikelet of a head in fruit ; the upper is attached to the back of the 
lower glume. 
Fig. 7. One of the other spikelets, seen from the inside of the head, exhibiting the lower glume, part of the 
upper one, and the upper half of the lower palea. 
Fig. 8. Different forms of the lower glume: a, narrow and obtuse; d, foliaceous at the upper half, —a very rare 
occurrence. 
Fig. 9. Lower palea of the flower : a, from the inside, rolled up; 3, outside, unfolded. | 
Fig. 10. Same of the fruit : a, from the inside, folded around the upper palea, both dorsal nerves of which are 
visible ; 3, same, unfolded. 
Fig. 11. Upper piten a, from the inner side, with the stigmata apc ; B, same from the back, showing 
both nerves ; c, upper palea including the ripe seed, seen from the inside ; scales visible. 
Fig. 12. Scales: a, hkiiete, b, pre yee ew' yas more magni ified. 
Fig. 13. Ovary with the styles, more magnified. At the base of the ovary one of the 3 rudimentary stamens 
and both scales are vi sible 
Fig. 14. Ovary, still more magnified, with all ey rudimentary stamens ; scales removed. 
Fig. 15. Part of a stigmatic hair, highly magn 
Fig. 16. Vertical section of a fruit-bearing rd serps both glumes (the outer upper one the longest 
and much thickened), both paleze and the 
Fig. 17. Grain: a, seen from the convex inner side armed towards the upper palea); }, horizontal, and ¢ 
vertical section of same ; a and 6 more magnifi 
