1916| Blake, — Limonium in North America and Mexico 57 



including type material of all the species recognized except L. Endlich- 

 ianum, has heen examined, and my best thanks are due the authorities 

 of these institutions for the opportunity to study the collections under 

 their charge. Through the kindness of Dr. Otto Stapf of the Kew 

 Herbarium tracings and fragments of several types have been acquired 

 for the Gray Herbarium. Unless otherwise noted, all specimens 

 cited are in the Gray Herbarium. 



Key to Species. 



Calyx glabrous (rarely with one or two hairs in nos. 2 and 3). 

 Branchlets loosely flowered; Atlantic coast species. 

 Calyx-lobes deltoid or oval, obtuse or rounded, 0.5(-l) mm. long; inner- 

 most bractlet oval, usually minutely retuse at the obtuse to rounded 



apex, 3.6 mm. long 1. carolinianum 



Calyx-lobes lance-ovate, acute, 0.7-1 mm. long; innermost bractlet 



broadly oblong, acute, 4.5 mm. long 2. angustatum 



Branchlets densely flowered; Pacific coast species 3. mexicanum 



Calyx pubescent at least at base. 

 Calyx-limb erect. 



Calyx (5.3) 6-7.5 mm. long, its lobes 1-1.7 mm. long. 



Calyx pubescent only at extreme base, or sometimes on one or two of 

 the ribs to the middle; outermost bractlet ovate, acute to acumi- 

 nate, 1.8-2 mm. long. 

 Scape strongly branched from near the base, the branches flexuose- 

 spreading; innermost bractlet broadly hyaline-margined, 5-6 



mm. long 4. Endlichianum. 



Scape branched from near the middle, the branches spreading- 

 ascending; innermost bractlet rather narrowly hyaline-mar- 

 gined, 3.S-4.5 mm. long 5. Nashii 



Calyx strongly pubescent to middle or beyond on all the ribs (rarely 

 one or two of them only sparsely hairy); outermost bractlet oval, 



abruptly pointed, 2.5-3.5 mm. long 6. trichogonum 



Calyx 4.3-5.5 mm. long, the lobes 0.4-0.8 mm. long. 



Calyx-lobes obtuse to subacute; hairs of calyx ca. 0.5-0.6 mm. long; 

 branchlets loosely flowered; Atlantic coast species. 



7. obtusilobum 

 Calyx-lobes acute or acutish; hairs of calyx ca. 0.2-0.3 mm. long; 

 branchlets densely flowered; Pacific coast species. 



8. califomicum 

 Calyx limb wide-spreading. 9. limbatum 



1. Limonium carolinianum (Walt.) Britton (as to syn. only). 

 Scape slender, solid, 2-6 dm. high. Leaves lance-spatulate to oblong- 

 obovate, obtuse or retuse at the often cuspidate apex, tapering into a 

 petiole about equal to blade, the lamina 5.3-17.5 cm. long, 1-5.2 cm. 

 wide. Panicle pyramidal, 14.5-30.5 cm. wide, the flowers loosely 

 secund on the ultimate branchlets; spikelets 1-2-flowered. Outer- 

 most bractlet of spikelet elliptic-ovate, often mucronulate or apicu- 

 late at the acute or acutish apex, with green midrib and base, broadly 

 hyaline-margined above, 1.5-2.2 mm. long; middle ovate, hyaline, 



