428 
LABURNUM 
Laburnum Linn. Leguminosae (ill. 3). 3 sp. Eur., W. As., of which 
Z. vulgare J. Presl. is the common laburnum of shrubberies. The 
flr. has a simple Trifolium-mechanism. There is no free honey; bees 
pierce the swelling at the base of the vexillum (cf. Orchis). All parts 
are poisonous. 
Lachenalia Jacq. Liliaceae (v). 30 sp. S. Afr. L. tricolor Jacq. a 
pretty little bulbous plant with two leaves, is in cultivation. 
Lachnanthes Ell. Haemodoraceae. i sp. Z. tinctoria Ell., N. Am., 
the paint-root. The roots yield a red dye. See Orig. of Species , 6th 
ed., p. 9. 
Lacistema Sw. Lacistemaceae. 16 sp. trop. Am. 
Lacistemaceae. Dicotyledons (Archichl. Piperales). Only genus 
Lacistema. Closely allied to Piperaceae. See Nat . PJl . 
Lactoridaceae. Dicotyledons (Archichl. Ranales). An order composed 
of the single sp. Lactoris fernandeziana Phil, from Juan Fernandez 
(p. 148). See Nat. PJl. Placed in Piperaceae by Benth. -Hooker. 
Lactoris Phil. Lactoridaceae. See order. 
Lactuca (Tourn.) Linn. (incl. Mulgedium Cass.). Compositae (xm). 
90 sp. chiefly N. temp. Old World; 4 in Brit. Z. Scariola L., the 
prickly lettuce, is a compass-plant when growing in dry exposed 
places (see Silphium). Z. saliva L. is the common lettuce used in 
salads. Its value depends on the latex. Fir. like Hieracium. The 
former is rapidly spreading in the U. S. as a weed (p. 141). 
Laaenbergia Klotzsch (excl. Cascarilla Wedd.). Rubiaceae (1. 4). 10 
sp. S. Am. 
Laelia Lindl. Orchidaceae (13). 20 sp. trop. Am. Often epiphytic. 
Like Cattleya. 
Lagenandra Dalz. Araceae (vn). 4 sp. Ceylon. 
Lagenaria Ser. Cucurbitaceae (ill). 1 sp. trop. Old World, Z. vuU 
garis Ser., the calabash-cucumber. The outer woody pericarp of the 
fruit makes an excellent flask. 
Lagerstroemia Linn. Lythraceae. 23 sp. Madag. to E. As. and 
Austr. Some are heterostyled like Lythrum. 
Lagetta Juss. Thymelaeaceae. 3 sp. W. Ind. Z. Lintearia Lam. is 
the lace tree. Its bast-fibres on removal from the stem (by macera- 
tion, &c.) form a network used for making dresses, &c. 
Lagoecia Linn. Umbelliferae (3). 1 sp. Medit. One of the usual 
two loc. of the ovary is aborted. 
Lagurus Linn. Gramineae (vm). 1 sp. Medit., Z. ovatus L., cultivated 
as an ornamental grass and for use in bouquets. 
Lamarckia Moench. Gramineae (x). 1 sp. Medit. 
Lamiales (Benth. -Hooker). The 10th cohort of Gamopetalae (p. 135). 
Lamium (Tourn.) Linn. Labiatae (vi. 4). 40 sp. Eur., As., extratrop. 
Afr. 5 in Brit., of which the chief are Z. album L. (white dead- 
nettle), Z. amplexicaule L. (henbit), Z. purpureuiti L. (purple dead- 
nettle) and Z. Galeobdolon Crantz (yellow archangel). Z. album has 
