BORAGINACEAE (;bORAGE FAMILY) 679 



5. HYDRdLEA L. 



Corolla 5-cleft. Filaments dilated at base. Capsule globular, with very 

 iarge and fleshy many-seeded placentae, thin-walled, 2-1-valved or bursting 

 irregularly. Seeds minute, striate-ribbed. — Herbaceous or scarcely shrubby, 

 growing in water or wet places, often having spines in the leaf-axils, and clus- 

 tered blue flowers. (Name unexplained, doubtless in part from vdup, water, in 

 allusion to the aquatic habitat.) Nama L., in part. 



1. H. af&inis Gray. Glabrous throughout ; stem ascending from a creeping 

 base ; leaves lanceolate, tapering to a very short petiole ; Jlowers in small axillary 

 leafy-bracted clusters,' divisions of calyx lance-ovate, equaling the corolla and 

 the irregularly bursting globose capsule. — Banks of streams, etc. , 111. to Tenn. 

 and Tex. June-Aug. 



2. H. quadrivdlvis Walt. Similar, but viUous-hispid above; divisions of 

 calyx linear or linear-lanceolate. — Wet ground, Va., and south w. July-Sept. 



3. H. ovata Nutt. Hirsute or puberulent ; leaves ovate ; flowers in terminal 

 leafy panicles ; calyx hirsute, with lanceolate divisions shorter than the corolla. 

 — Mo. to La. and Tex. June-Aug. 



BORAGINACEAE (Borage Family) 



Chiefly rough-hairy herbs, with alternate entire leaves, and symmetrical 

 floxoers with a 5-parted calyx, a regular b-lobed corolla (except in Echium), 

 5 stamens inserted on its tube, a single style and a usually deeply ^-lobed ovary 

 (as in Labiatae) , /ormzngr in fruit 4 seed-like 1-seeded nutlets, or separating into 

 two 2-seeded or four 1-seeded nutlets. Albumen none. Cotyledons plano- 

 convex ; radicle pointing to the apex of the fruit. Stigmas 1 or 2. Calyx 

 valvate, the corolla imbricated (in llyosotis convolute) in the bud. Flowers 

 mostly on one side of the branches of a reduced cyme, imitating a spike or 

 raceme, which is rolled up from the end, and straightens as the blossoms 

 expand (circinate or scorpioid), often bractless. — A rather large family of 

 innocent mucilaginous and slightly bitter plants ; the roots of some species 

 yielding a red dye. 



N.B. — In this family the figures represent the inflorescence (or a portion 

 of it) X I and details (flower, fruiting calyx, or nutlet) x 2. 



Tribe I. HELIOTROPIeAE. Ovary not lobed ; fruit separating into 2-4 nutlets. 



1. Heliotropium. Corolla salver-form. Stamens included. Nutlets 1-2-celled. 



Tribe II. BORAGInEAE. Ovary deeply 4-parted, forming as many separate 1-seeded nutlets in 

 fruit ; style rising from the center between them. 



* Nutlets attached laterally. 

 +- Nutlets armed with prickles ; throat of corolla closed by 5 scales. 



2. Cynoglossum. Nutlets horizontally radiate, much produced downward, covered with barbed 



prickles. 



3. Lappula. Nutlets erect or ascending, the margin or back armed with barbed prickles. 



-»- +- Nutlets at most granular-roughened. 



4. Amsinckia. Calyx simply but deeply 5-cleft. Corolla yellow, with slender tube and op«D 



throat. 



5. Aspentgo. Calyx with 5 broad flat veiny lobes and 5 smaller alternating ones. Corolla blue. 



* * Nutlets attached at or near the base, smooth or merely wrinkled, not prickly. 



+■ Throat of corolla closed by 5 scales. 



++ Corolla and stamens regular; achene with large excavated scar. 



6. Symphytum. Corolla short-tubular, enlarged above, closed by 5 linear-subulate 



