GRASSES IN THE BERNHARDI HERBARIUM. 55 
XYSTIDIUM BARBATUM J. S. Presl in C. B. Presl Reliq. 
Haenk. 1: 228. (1830). ‘* Hab. in insula Luzonia.”’ = 
Perotis rara R. Br. Prod. 72. 
EXPLANATION OF PLATES ILLUSTRATING PRESL GRASSES. 
All of the illustrations, executed under my direction by 
Mrs. M. D. B. Willis, née Baker, unless otherwise stated 
were drawn from specimens in the herbarium of the Mis- 
souri Botanical Garden, labeled in Presl’s handwriting, 
and unless otherwise noted the habit-sketches have been 
reduced one-half. The enlargement of the details is suffi- 
ciently indicated by the enlarged scale accompanying them. 
Plate 1. Saccharum spicatum Presl. Island of Luzone. —a, Spikelet; 
b, dorsal view of first glume; c, dorsal view of second glume; d, pistil; 
e, flowering glume; f, palea, 
Plate 2. 1, Pogonopsis tenera Presl. Mexico. —a, A pair of spikelets; 
b, first glume; c, second glume; d, flowering glume; e, palea—all of 
the sessile spikelet. 2, Andropogon tenellus Presl. — a, Spikelet; b, first 
glume; c, second glume; d, third glume; e, flowering or fourth 
~ glume, 
Plate 3, Andropogon malacostachyus Presl. Acapulco. Natural size. — 
a, Joint of the rachis with sessile and pedicellate spikelets; b, first 
glume; c, second glume; d, third glume; e, flowering glume; f, 
lodicules. 
Plate 4. Diectomis angustata Presl.—a, Pair of spikelets showing 
joint of rachis and side view of sessile spikelet; b, pistillate spikelet; c, 
first glume; d, second glume; e, third glume; f, flowering glume; g, 
palea and lodicules; h, pistil; i, stamens— all belonging to the sessile 
and fertile spikelet; k, first glume; 1, second glume; m, third glume; n, 
flowering glume; 0, palea with stamens and lodicules — all belonging to 
the pedicellate and staminate spikelet. 
Plate 5. Hexarrhena cenchroides Presl. Mexico.—a, Group of spike- 
lets; b, lateral spikelets; c, lateral floret, outer glumes removed; d, e, 
outer glumes of the pistillate spikelet; f, pistillate floret; g, palea of 
same; h, pistil, most of the style removed. 
Plate 6. Thysanachne peruviana Presl. High mountains of Peru. — 
a, Spikelet; b, third glume, inner view showing its palea; c, fertile 
flower. 
Plate 7. Thysanachne scoparia Presl. —a, Spikelet; b, first glume; c, 
second glume; d, third glume; e, palea of third glume; f, flower; g, 
palea and lodicules. 
