PlOSCOREACE^E. (YAM FAMILY.) 



the spnthe : otherwise much as in the last. Gravelly shores of Lakes Huron 

 and Michigan. May. 



I. pfraiiLA, L., the DWARF IRIS of the Old "World, and I. SAMBUC!NA, L., 

 the common FLOWER-DE-LUCE (i. e. F ' leur-de-Lis) , are familiar in gardens. 



2. SISITRINCIIIUM, L. BLUE-EYED GRASS. 



Perianth 6-purted ; the divisions alike, spreading. Stamens monadelphous. 

 Stigmas involute-thread-like. Pod glohular-3-angled. Seeds globular. Lou 

 slender perennials, with fibrous roots, grassy or lanceolate leaves, mostly branch- 

 ing 2-edged or winged stems, and fugacious umbelled-clustercd small flowers 

 from a 2-leaved spathe. (Name composed of (TVS, a hoc/, and pvyxos, snout, 

 from a fancy that the hogs are fond of rooting it up.) 



1. S. 15>Miiu<lifaii:i, L. Scape winged, naked, or 1 - 2-leaved ; leaves 

 narrow and grass-like; divisions of the perianth obovate, more or less notched 

 at the end, and bristle-pointed from the notch. (Leaves of the spathe almost 

 equal, shorter than the flowers.) Var. ANCEPS (S. anceps, Cay.) has a 

 broadly winged scape, and the outer leaf of the very unequal spathe longer than 

 the flowers. Var. MUCRONATUM (S. mucronatum, Michx.) has a slender and 

 narrowly winged scape, very narrow leaves, those of the spathe sharp-pointed, 

 unequal, one of them usually longer than the flowers. But there are various 

 intermediate forms. Moist meadows, &c., among grass ; common everywhere. 

 June -Aug. Flowers small, delicate blue, changing to purplish, rarely whit- 

 ish, 4-6 opening in succession. 



THE CROCUS, the CORN-FLAG (GLADIOLUS), the BLACKBERRY LILY (PAR- 

 DANTHUS CHINENSIS), and the TIGER-FLOWER (TlGBiDiA PAV6MA), aro 

 common cultivated plants of the family. 



ORDER 124, DIOSCOREACE^E. (YAM FAMILY.) 



Plants with homing stems from large tuberous roots or knotted rootstocks, 

 and ribbed and netted -veined petioled leaves, small dioecious 6-androtis and 

 regular flowers, with the Q-cleft calyx-like perianth adherent in the fertile 

 plant to the 3-celled ovary. Styles 3, distinct. Ovules 1 or 2 in each cell, 

 anatropous. Fruit usually a membranaceoufl 3-angled or winged pod. 

 Seeds with a minute embryo in hard albumen. Represented chiefly 

 by the genus 



1. I>IOSOREA, Plumier. YAM. 



Flowers very small, in axillary panicles or racemes. Stamens 6, at the base 

 of the divisions of the 6-partcd perianth. Pod 3-crlli-d, .'J-wing'-d, loculiridally 

 3-valved by splitting through the winged angles, Seeds 1 or 2 in each cell, flat, 

 with a membranaceous wing. (Dedicated to the Greek naturalist Dioscoride*.) 



] D. villos;i, L. (Wn.D YAM KOOT.) IlcrlKurous ; leaves mostly 

 alternate, s(jnietiiu<-< nearly ^opposite or in lours, more or less <lo\vny under- 



